Correlation Coefficients and Other Constants for Combined and Separated Distributions
There are numerous occasions when one wishes to obtain correlation coefficients and other series constants from several populations combined into one, or from a breakdown of a general population into two or more sub populations. It is somewhat arduous to make new tabulations of the combined or separated populations. There are methods by which any number of tabulated distributions may be combined without additional tabulation or un due labor of calculation, and by which any tabulated distribution may be separated out from a compound table without further tabu lation. The methods are equally applicable to calculations based on paired series which have not been tabulated, but for convenience of expression series will be spoken of as though tabulated.