A computer program is described that constructs and visually displays isodensity ellipses of a bivariate normal distribution for a maximum number of 100 pairs of values. The numbers of actual points within the ellipses can be compared with the theoretically expected frequencies by a chi-square analysis.
Dixon, W. J. (Ed.). BMD: Biomedical computer programs (2nd ed.). Berkeley, CA: University of California, 1968 .
3.
Ferguson, G. A.Statistical analysis in psychology and education (4th ed.). New York: McGraw-Hill, 1976.
4.
Glass, G. V. and Stanley, J. C.Statistical methods in education and psychology. Englewood Cliffs, N. J.: Prentice-Hall , 1970.
5.
Nie, N. H., Hull, C. H., Jenkins, J. G., Steinbrenner, K., and Bent, D. H.Statistical package for the social sciences (2nd ed.). New York: McGraw-Hill, 1975.
6.
Tatsuoka, M. M.Multivariate analysis: Techniques for educational and psychological research. New York: Wiley, 1971.
