Nonparametric rank-ordercorrelationprocedures, such as Spearman's rho and Kendall's tau, are often used as alternativesto Pearson's r, their parametric counterpart, when assumptions underlying that procedure cannot be met. Kendall's tau is a particularly useful alternative in that it may be generalizedto a partial correlation coefficient. This article describes an easy-to-use BASIC program for the calculationof both Kendall's tau and Kendall's partial rank correlation coefficient. Kendall's tau. The tau procedure, like mostother nonparametricprocedures, requiresat leastordinal leveldata and assumesthat these data have been drawn from distributionsthat are continuous. The 5 statistic, a measureof disarray, represents the numerator term in the tau procedure. The sampling distributions of 5 and tau are identical in a probability sense (Hays, 1972). Therefore, the significance of tau maybe determined by referring to either. Kendall has determined the exact sampling distribution of 5 for N=4 to N= 10 (Kendall, 1970). For N