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Stata Tip 109: How to Combine Variables with Missing Values

The Stata Journal: Promoting communications on statistics and Stata

Impact Factor: 3.0 / 5-Year Impact Factor: 6.5

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First published online June, 2012

Stata Tip 109: How to Combine Variables with Missing Values

Volume 12, Issue 2

https://doi.org/10.1177/1536867X1201200212

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Book Reviews : David A. Payne and Robert F. McMorris (Eds.). Educational and Psychological Measurement,Contributions to Theory and Practice. (2nd. ed.) Morristown,N. J.: General Learning Corporation,1975. Pp. xx + 397. $6.50 (paperback