Smith, J. G., & Duncan, A. J. (1944). Analysis of a multivariate frequency distribution illustrated. In J. G. Smith & A. J. Duncan, Elementary statistics and applications: Fundamentals of the theory of statistics (pp. 437-468). New York, NY, US: McGraw-Hill Book Company.
http://dx.doi.org/10.1037/13565-016
To illustrate the analysis of a multivariate frequency distribution, data on grades of 81 freshmen in a woman's college were selected. These are arranged in Table 47 in such a way as to facilitate the construction of simple linear-correlation tables and to facilitate detailed study of the multivariate distribution. The first part of this chapter will illustrate trivariate-frequency-distribution analysis. The X₄ variable is included in the table so that later in the chapter the analysis can be extended to four variables. Beyond four variables, the method proceeds in a symmetrical fashion. (PsycINFO Database Record (c) 2016 APA, all rights reserved)