TTEST Procedure

The TTEST procedure now performs TOST equivalence analyses, analyses of treatment and period in AB/BA crossover designs, weighted Satterthwaite tests and confidence intervals, analyses of ratios, and one-sided analyses. It supports both normal and lognormal data. Sasabuchi tests and Fieller confidence intervals are computed for normal ratios. PROC TTEST now provides graphs, including histograms, densities, box plots, profiles, agreement plots, Q-Q plots, and interval plots. The new ORDER= option in the PROC TTEST statement specifies the sorting order for the levels of classification variables (specified in the CLASS statement) and crossover treatment variables (specified in the CROSSOVER option in the VAR statement).