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Abstract

Daily high/low and close/open prices are the key parameters of candlestick approach in technical analysis. Besides, the price spreads are also important as they represent an upward or a downward trend. In this study, we investigate the relationship between daily high/low prices and close/open prices for precious metals: gold, copper, palladium, and silver. Empirical analysis has been performed through fractionally cointegrated vector autoregression (FCVAR) model. To observe the relationships, the trends are tested for their characteristics in both states: positive and negative spreads in close/open prices. Results indicated that for a positive trend, high/low spreads have a negative impact on close/open spreads in long run relationship. However, when closing price is less than the opening prices, it is revealed that expanding range in high/low spreads causes a rise in close/open spreads for copper and silver differently from gold price.

Keywords

FCVAR model candlestick method technical analysis precious metals

Introduction

Predictability of asset prices is most likely the most appealing topic in finance literature. Random walk and Efficient Market Hypothesis of Fama (1965, 1970) and subsequent studies, which either support or criticize these theories, occupy a significant portion of finance literature. Observed patterns in financial time series motivate researchers to predict the direction of asset prices and, therefore, the returns. Consequently, two basic approaches have evolved in finance theory: fundamental analysis and technical analysis. These two approaches evaluate the price innovations from two different perspectives.

As stated by Lo, Mamaysky, and Wang (2000), the main objective in technical analysis is to extract the nonlinear patterns from noisy data. To put a finer point on it, technical analysis tries to catch some certain price patterns in time series through particular mathematical models to predict the future price movements. According to technical analysis, while some price movements serve to form certain patterns, other price changes are solely random. However, fundamental analysis states that asset prices are martingale, that is, price innovations are random and historical price behaviors cannot be used for predictions, because current stock price already incorporates and reflects past relative information. Therefore, it can be said that fundamental analysis attempts to measure intrinsic value of an asset by evaluating respective economic and financial variables at macro and micro level.

As stated by Lan, Zhang, and Xiong (2011), one of the essential methods in technical analysis is candlestick approach which was introduced by Japanese rice traders in the mid of 16th century. Candlestick approach can be seen as the combination of line and bar charts. Structure of candlesticks includes the following price information: open price, close price, daily high price, and daily low price. When the close price is higher than the open price then the main body of candlestick is to be hollow. If the close price, however, is less than the open price then candlestick will be filled, usually with red color. The lines above and below the main body correspond to daily high and daily low prices, respectively. These lines are called as tails or shadows. Edge of these lines show the lowest price of day (at bottom) and highest price of day (on top). The spread of this high/low prices and close/open prices gives some clues regarding the market fluctuation and direction of price movement. For example, when we have higher spreads in high/low prices, it means that in tick period, the fluctuations in the prices are large and vice versa. In addition, if the close/open spread is positive, it means that the asset price has an upward trend, conversely, for a negative spread in close/open spread asset prices have a downward trend in the tick period.

In the current study, based on the dynamics of candlestick method, we seek to examine the relationship between high/low spreads and close/open spreads. Our theoretical expectation is to see larger values in close/open spreads for large high/low spreads, because widening high/low spreads are the indicators of uncertainty in asset prices. When we have high volatility in the market, it means that asset prices might go any direction (up or down) wildly and these innovations might bring wider spreads between daily high and low prices. Therefore, any uncertainty or fluctuation during the day might cause greater margin in close/open spreads in a tick period.

Literature Review

In this section, we classify the literature under two groups: technical analysis based on candlestick studies and econometric dimension for fractionally cointegrated vector autoregression (FCVAR) model.

Morris (2006) demonstrates that provided the trend is defined correctly, candlestick analysis might bring true trading signals. Lan et al. (2011) introduce a new candlestick analysis which determines reversal points in stock price through fuzzy logic theory. They show that proposed model convincingly identifies turning points in selected stocks. Roy, Sharma, and Kowar (2012) also investigate the performance of candlestick analysis using a fuzzy logic approach. Xie, Zhao, and Wang (2012) examine the performance of candlestick method and state that candlestick method provides predictive information of in-sample (IS) and out-of-sample (OOS) forecasts. However, Prado, Ferneda, Morais, Luiz, and Matsura (2013) reveal that candlestick patterns do not bring predictive information for the future forecasts in Brazilian stock market. Similarly, Joseph et al. (2015) also suggest that candlestick analysis itself is not enough to increase the accuracy in trading strategies. In a different study, Li, Feng, and Feng (2015) rather apply candlestick charts in prediction of stress level change of teens on a micro-blog platform and verify the power of the method. Similar to the study by Prado et al. (2013), by using the bootstrap methodology, Marshall (2005) demonstrates that an investor cannot outperform the benchmark market index through candlestick analysis. Caginalp and Balevonich (2003) develop a foundation for the technical analysis through a dynamical microeconomic model and implement the model in candlestick analysis. Tharavanij, Siraprapasiri, and Rajchamaha (2017) examine the performance of bullish and bearish candlestick reversal patterns through applying the skewness adjusted t test and the binomial test. Results show that candlestick patterns are not robust in the estimation of market directions.

The FCVAR model is a relatively new method in literature and it is introduced by Johansen (2008) and Johansen and Nielsen (2010, 2012, 2014). As the model is quite new, there are only a limited number of studies available in finance literature which has used this model. In one of the studies, Dolatabadi, Nielsen, and Xu (2016), later, improved the model by allowing deterministic linear trends in the observed variables. They implement this extended model on commodities such as aluminum, copper, lead, nickel, and zinc to see the relationship between spot and futures prices. By using the FCVAR model, Maciel (2017) analyzes daily high and low prices of the assets listed in Brazilian stock market; his results suggest a cointegration relationship between variables. Carlini and Santucci de Magistris (2013) discuss identification problems in FCVAR model. They stress on the importance of evaluation of F(d) condition, which is the generalized form of I(1) and indicates fractional difference, for the fractional parameters and lag structure. Gil-Alana, Mudida, and Carcel (2017) examine electricity prices in Kenya through FCVAR model. Results reveal that series are fractionally cointegrated and oil prices and interest rates have significant positive effects on electricity prices. Baruník and Dvořáková (2015) investigate the long run relationship in daily high and low stock prices by utilizing FCVAR model. They concluded that FCVAR model is a useful alternative to model the range-based volatility.

Method

To attain the fractionally cointegrated vector autoregressive model, the easiest way to start is using well-known cointegrated vector autoregression (CVAR) model of Johansen (1995). By following the definition of Dolatabadi et al. (2016), FCVAR model can be presented as follows: for $Y_{t}$ which is p dimensional nonstationary, I(0), time series,

Δ Y_{t} = α β^{'} Y_{t - 1} + \sum_{i = 1}^{k} Γ_{i} Δ Y_{t - i} + ε_{t} = α β^{'} L Y_{t} + \sum_{i = 1}^{k} Γ_{i} Δ L^{i} Y_{t} + ε_{t},

where $ε_{t}$ i.i.d. with mean zero and covariance matrix $Ω$ and $L = 1 - Δ$ . By replacing lag ( $Δ$ ) and difference ( $L = 1 - Δ$ ) operators with fractional equivalents $Δ^{b}$ and $L_{b} = 1 - Δ^{b}$ , we can derive $Δ^{b} Y_{t}$ as below:

Δ^{b} Y_{t} = α β^{'} L_{b} Y_{t} + \sum_{i = 1}^{k} Γ_{i} Δ^{b} L_{b}^{i} Y_{t} + ε_{t},

and for $Y_{t} = Δ^{d - b} X_{t}$ , FCVAR model is as follows:

Δ^{d} X_{t} = α β^{'} L_{b} Δ^{d - b} X_{t} + \sum_{i = 1}^{k} Γ_{i} Δ^{d} L_{b}^{i} X_{t} + ε_{t},

where long run parameters are $p \times r$ matrices with $0 \leq r \leq p$ . For the long run equilibrium, $β^{'} X_{t}$ denote cointegrating vectors and parameters in $α$ are correction coefficients which display the speed of correction toward equilibrium for each of the variables. The short-run features of the variables are regulated by the parameter $Γ_{i}$ in the autoregressive augmentation. Differently from CVAR model, FCVAR model accommodates also $d$ and b parameters. Here $d$ is the fractional integration parameter and b regulates the degree of fractional cointegration. The parameter $b$ shows the power of cointegration relationships and is also called as the cointegrating gap. In FCVAR model, $X_{t}$ is fractional of order $d$ and cofractional of order $d - b$ , and so $β^{'} X_{t}$ will be fractional of order $d - b \geq 0$ (Maciel, 2017). A greater value in $b$ indicates lower persistence in this relationship. For $d = b = 1$ , FCVAR model reduces to CVAR model (Dolatabadi et al., 2016).

Empirical Analysis

In this study, we implement FCVAR model of Johansen (2008) and Johansen and Nielsen (2010, 2012, 2014) for precious metals: gold, copper, palladium, and silver. In empirical analysis, we examine the impact of daily high/low spreads on close/open spreads. These two spreads present very useful information in the technical analysis and are used in candlestick method. The period we analyze is from January 2, 2002, to November 22, 2017. All the data are obtained through www.stooq.com and empirical analysis is conducted through Matlab codes of Nielsen and Popiel (2014) and Rhinelander (2015). Daily spreads of the data can be seen in Figure 1.

Figure 1.

Daily spreads of variables.

Before proceeding long run relationship in corresponding spreads first, we test fractional integration through Hurst and detrended fluctuation analysis (DFA) analysis to see whether FCVAR is a relevant model. Following long memory analysis, we implement FCVAR model and discuss the results.

Fractional Integration Tests

In our empirical analysis, we use the FCVAR model of Johansen (2008) and Johansen and Nielsen (2010, 2012, 2014). As stated by Chen and Hurvich (2003), while standard cointegration analysis utilizes only integer values (where $d$ and $d_{u}$ is 1 and 0, respectively), the fractional cointegration model allows to take fractional values for the memory parameter which has positive values with $d - d_{u}$ . The FCVAR is the extended version of classical vector autoregression (VAR) model for the fractionally integrated time series. To find out whether FCVAR is the relevant model for our data, we check the long memory feature (fractional processes) of our time series through Hurst and DFA methods. Both Hurst and DFA are semiparametrical methods and they yield the Hurst exponent $H$ . The $H$ is measurement of long range dependence in a time series. For a given $H$ value between 0.5 and 1, the series has long memory and auto-covariances decay hyperbolically. The case when $H$ value is between 0 and 0.5, the process has a short memory and suggests mean reversion. For $H = 0.5$ , the time series performs random walk behavior (Mandelbrot & Van Ness, 1968). As stated by Zivot and Wang (2007), the Hurst method (Hurst, 1951), which is also called as R/S analysis, is the range of partial sums of deviations of a time series from its mean, rescaled by its square root of variance. On the contrary, the DFA method which is introduced by Peng et al. (1994) follows a different procedure. In this method, the entire series $N$ is divided in to $N / l$ nonoverlapping boxes, and local trend is calculated for each. Next step is the definition of “detrended walk” to reveal the difference between original innovation and local innovations. Finally, average variance $F_{d}^{2} (l)$ is attained from the variances about the detrended walk in each box which has size $l$ . As discussed in Baillie (1996), by means of the equation $d = H - 0.5$ , we can convert Hurst exponent $H$ into fractional difference, $d$ . Considering this relationship, we attain $H$ values by using Matlab codes of Weron (2011a, 2011b). Results are given in Table 1.

Table 1.

Fractional Process Tests.

	Hurst—H	DFA—H	Hurst—d	DFA—d
Gold—oc Gold—hl	0.5252 1.046	0.4984 1.07	0.0252 0.546	−0.0016 0.57
Copper—oc Copper—hl	0.5875 1.035	0.5428 1.06	0.0875 0.535	0.0428 0.56
Palladium—oc Palladium—hl	0.5489 0.9291	0.5018 0.9694	0.0489 0.4291	0.0018 0.4694
Silver—oc Silver—hl	0.5536 1.087	0.5383 1.1	0.0536 0.587	0.0383 0.6

Note. Confidence intervals for Hurst and DFA test are as follows: [0.4143, 0.5814] and [0.4208, 0.5653]. DFA = detrended fluctuation analysis; oc = open/close; hl = high/low.

As seen in Table 1, first and second columns present the Hurst exponent $H$ . Fractional parameter $d$ can be seen in last two columns for each univariate time series. The estimates of $d$ for the high/low spread are greater than the open/close spread. In most cases (except for gold-oc in DFA method), while open/close spreads exhibit long memory, high/low spreads demonstrate nonstationary processes. Besides, as all of the fractional parameters $d$ are in the 0 to 1 range, we can say that all high/low and open/close spreads display fractionally integrated rather than integrated in first difference, I(1). Due to the fact that long memory and fractional integration are the patterns observed in our variables, as suggested by Maciel (2017), traditional cointegration analysis would not be satisfactory to explain long run relationship in our model.

Specification of FCVAR Model

Following the long memory analysis of time series likewise, in conventional VAR model, we should define the lag augmentation of the system. Here, in this stage, we follow the general to specific order of Jones, Nielsen, and Popiel (2014) and use $k = 3$ as lag value. By testing the significance of coefficient of highest order lag, we decide to move on other lag level. As can be seen in Table 2, we have five estimations in the corresponding lag levels for each variable. For each level, we check the significance through likelihood ratio (LR) test, and based on the results (if null hypothesis is not rejected) by dropping the highest order lag, we continue to the next model.

Table 2.

Lag Selection Results.

	k	r	d	b	Log-likelihood	LR	p value	AIC	BIC
Model for Gold	3	2	0.026	0.026	−30,023.6	5.500	.239	60,085.13	60,204.94
	2	2	0.148	0.148	−30,026.3	32.24	.000	60,082.63*	60,177.22
	1	2	0.010	0.010	−30,042.4	91.67	.000	60,106.88	60,176.24*
	0	2	0.239	0.239	−30,088.3	0.000	.000	60,190.54	60,234.68
Model for Copper	3	2	0.117	0.117	−21,392.6	9.710	.046	42,823.20*	42,943.01
	2	2	0.238	0.238	−21,397.5	79.11	.000	42,824.91	42,919.50*
	1	2	0.010	0.010	−21,437.0	68.00	.000	42,896.02	42,965.38
	0	2	0.289	0.289	−21,471.0	0.000	.000	42,956.03	43,000.17
Model for Palladium	3	2	0.010	0.010	−27,599.6	6.130	.190	55,237.15	55,356.96
	2	2	0.187	0.187	−27,602.6	12.33	.015	55,235.28*	55,329.86
	1	2	0.010	0.010	−27,608.8	51.84	.000	55,239.61	55,308.97*
	0	2	0.270	0.270	−27,634.7	0.000	.000	55,283.45	55,327.59
Model for Silver	3	2	0.171	0.171	−39,452.8	6.240	.182	78,943.66	79,063.47
	2	2	0.188	0.188	−39,456.0	14.84	.005	78,941.90*	79,036.49
	1	2	0.057	0.057	−39,463.4	214.4	.000	78,948.74	79,018.10*
	0	2	0.355	0.355	−39,570.5	0.000	.000	79,155.09	79,199.23

Note. LR = likelihood ratio; AIC = Akaike information criterion; BIC = Bayesian information criterion.

Indicate the best (that is, minimized) values of the respective information criteria.

Results indicate that except for the model of palladium, as the coefficient of highest order lag is significant at 99% confidence level, in all other systems, we choose $l a g = 2$ . In determination of the best fitted lag level for each model, the next step is to select the appropriate rank which is number of the cointegrated vectors in the system. Regarding the rank of systems, we test the following hypothesis: $H_{0} : r a n k = r$ and $H_{1} : r a n k = p$ , here $r = 0, 1, 2, …$ and $p$ is the number of variables in the system. For the alternative ranks, the first nonrejected value is the number of cointegrated vectors in the system. Accordingly, as seen in Table 3, except for the model of palladium, in each model, we reject $r = 0$ with a $p$ value of .0000 and accept $r = 1$ in $p$ values .176, .405, and .634 for gold, copper, and silver, respectively. These results show that in these systems, we have one cointegrated vector. As we reject the null hypothesis in $r = 1$ for the palladium in next stage, we will remove this variable from our analysis.

Table 3.

LR Tests for Cointegrating Rank.

	Rank	d	b	Log-likelihood	LR statistic	p value
Gold	0	0.010	0.010	−30,043.893	35.152	.000
	1	0.144	0.144	−30,027.234	1.834	.176
	2	0.148	0.148	−30,026.317	—	—
Copper	0	0.010	0.010	−21,437.749	80.586	.000
	1	0.240	0.240	−21,397.803	0.694	.405
	2	0.238	0.238	−21,397.456	—	—
Palladium	0	0.107	0.107	−27,637.00	56.471	.000
	1	0.023	0.023	−27,614.20	10.722	.001
	2	0.010	0.010	−27,608.80	—	—
Silver	0	0.030	0.030	−39,463.275	14.648	.005
	1	0.185	0.185	−39,456.065	0.227	.634
	2	0.188	0.188	−39,455.951	—	—

Note. As it is pointed by Nielsen and Popiel (2014), p values for the cointegration rank tests are not provided by the main code. Researcher should use additional code of Jason Rhinelander: https://github.com/jagerman/fracdist/releases. LR = likelihood ratio.

Following the proper selection of lag and rank of systems, in this stage, we estimate and interpret the parameters of our models. Results are given in Table 4. We also provide the inverse roots of the characteristic polynomial in Figure 2. A high spread between daily high and low prices of any asset indicates a high fluctuation in trading day. Theoretically speaking, existence of large range in high/low spreads would cause a large range in close/open spreads, because larger spread in daily high and low prices would bring an uncertainty in the direction of asset price, and this uncertainty would lead to a high range in close/open spread as well. However, according to our results in Panel 1, in long run equilibrium models, we have a negative relationship between high/low and close/open spreads with following values for beta in cointegrating equations: −0.196, −0.069, and −0.045. These results indicate that large high/low spreads lead to decrease in close/open spreads. This finding shows that when range in high/low spreads increases, it would provide less fluctuation in daily close/open spreads. These results are not consistent with our theoretical expectations. However, it should be kept in mind that so far we did not take into account the following fact: closing price might be lower than the opening price in a tick period. Therefore, based on the location of closing price on open price, the spread might be negative or positive.

Table 4.

Fractionally Cointegrated Vector Autoregression: Estimation Results.

	Model for	$d$	Cointegrating equations beta
	Model for	$d$	Open/close spread	High/low spread
Panel 1: Full Series	Gold	0.144(0.015)	1.000	−0.196
	LMp value		2.495.998	8.710.727
	Copper	0.240(0.014)	1.000	−0.069
	LMp value		10.987.530	14.780.254
	Silver	0.185(0.020)	1.000	−0.045
	LMp value		4.800.964	4.865.962
Panel 2: Positive Spreads	Gold	0.302(0.028)	1.000	−0.331
	LMp value		6.491.889	7.673.810
	Copper	0.010(0.000)	1.000	−0.071
	LMp value		8.881.713	12.312.421
	Silver	0.190(0.017)	1.000	−0.574
	LMp value		7.184.845	10.455.576
Panel 3: Negative Spreads	Gold	0.010(0.001)	1.000	−0.375
	LMp value		5.507.939	7.772.803
	Copper	0.236(0.030)	1.000	0.439
	LMp value		15.042.239	18.153.111
	Silver	0.609(0.042)	1.000	0.482
	LMp value		7.624.814	10.051.612

LM represents Breusch - Godfrey Lagrange Multiplier test for serial correlation in the residuals.

Figure 2.

Inverse roots of the characteristic polynomial.

By considering two possible locations of closing price in a tick period, it might be greater or lesser than the opening price, we reclassify our data: we separate the negative close/open spreads from positive spreads and match each daily spread with the corresponding high/low spread. For factoring in this specification, we estimate two more models (Panel 2 and Panel 3) for each variable. This correction would allow us to consider the trend in time series. Because, if closing price is less than the opening price, it would yield a downward trend in the asset price, or vice versa.

Following the reclassification of our data in our first model (Panel 2), we investigate the positive spread in close and open prices. Here, in this case, closing price is above the opening price, that is, we have upward trend. For the second condition (Panel 3), the closing price is below the opening price and therefore a negative spread. According to our findings for Panel 2, just as similar to the results in Panel 1, any increases in high/low spreads lead to decrease in open/close spreads in long run. However, Panel 3 indicates that if the closing price is less than the opening price, that is, asset price has a downward trend, with higher fluctuations in a tick period, the open/close spread widens in copper and silver variables. However, the results in gold model still remain consistent with the previous model. Higher fluctuations in gold prices during the day will cause lower spread in open/close prices. These results are also supported by the diagnostic statistics of the model. According to the results of LM test, it can be seen that residuals do not display a correlation in all variables and models.

Conclusion

The patterns seen in asset prices in past might repeat afterward. This is the key assumption of technical analysis. One of the basic tools in technical analysis is candlestick method which is based on examination of daily high/low and close/open prices. Although there is an interest to this method and its parameters, to the best our knowledge, the relationship between these prices are not examined in literature. Hence, considering this gap, in this study, we analyzed the long run relationship between high/low and close/open spreads of some precious metals—gold, copper, palladium, and silver—through a new method: FCVAR model. As FCVAR model allows the fractional cointegration which is one of the stylized facts of financial time series, comparatively, it can present more robust and reliable results for the researchers. Our analysis is conducted for two different conditions. In the first section, we analyzed the effect of high/low spreads on close/open spreads. Results of beta in cointegrating equations showed that there is a statistically significant long run relationship between these two variables: high/low spreads has negative impact in close/open spreads. This situation means that larger ranges in high/low spreads lead to smaller close/open spreads in the long run. As the results are not consistent with our theoretical expectations, the model was modified to differentiate between a positive and negative close/open spreads. Therefore, in this section, we matched the corresponding data by separating negative and positive spreads in close/open spreads. Results exhibited that while the model for gold prices display the same sign in beta parameter, the sign of copper and silver has been positive, meaning that increasing spread in high/low prices lead to a rise in close/open spread provided that the closing price is lower than the opening prices.

Footnotes

Declaration of Conflicting Interests

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

Author Biography

Samet Gunay is currently an assistant professor at American University of the Middle East, Kuwait in Finance Department. He has been a visiting PhD student and visiting scholar at the National University of Singapore in 2013 and at the Indiana State University, USA, in 2014, respectively. His major is in finance and research interest focuses on fractals and financial econometrics. He received his PhD degree from Istanbul University in 2013 and earned associate professor title from Inter-university Council of Turkey in 2017.

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Fractionally Cointegrated Vector Autoregression Model: Evaluation of High/Low and Close/Open Spreads for Precious Metals

Abstract

Keywords

Introduction

Literature Review

Method

Empirical Analysis

Fractional Integration Tests

Specification of FCVAR Model

Conclusion

Footnotes

Declaration of Conflicting Interests

Funding

Author Biography

References