Wilcoxon Test Sas Interpretation. Practically speaking we conclude that endurance performance times differ between treatments. PROC NPAR1WAY also gives a t approximation for the Wilcoxon two-sample test.
Indeed you have to divide the resulting p-value by two in order to obtain the appropriate p-value for the one-sided test. PROC NPAR1WAY performs tests for location and scale differences based on the following scores of a response variable. Because the sample size is small the large-sample normal approximation might not be adequate and it is appropriate to compute the exact test.
I believe SAS provide more output when you execute the statistical test.
Nov 14 2015 Apparently the author of your book performed a one-sided Wilcoxon signed rank test hopefully with good reason whereas the p-value from PROC UNIVARIATE corresponds to a two-sided test. Weight Mean Median Std Dev N Skewness Kurtosis. The WILCOXON option requests an analysis of Wilcoxon scores. PROC UNIVARIATE provides the ability to test for normality while PROC NPAR1WAY provides the ability to perform classic nonparametric tests.
