A class of post hoc tests that provide this type of detailed information for ANOVA results are called "multiple comparison analysis" tests. The most commonly used multiple comparison analysis statistics include the following tests: Tukey, Newman-Keuls, Scheffee, Bonferroni and Dunnett. These statistical tools each have specific uses, advantages. are different. Therefore we perform Multiple Comparisons or Post Hoc analysis. Can choose: DUNCAN, SNK,LSD,TUKEY,SCHEFFE. For example: We use SNK MEANS GROUP/ SNK ALPHA=0.05; PROC ANOVA DATA=READING; TITLE "READING ANOVA"; CLASS GROUP; MODEL WORDS = GROUP; MEANS GROUP/ SNK ALPHA=0.05; RUN; The ANOVA Procedure 3.