Now Playing: Mixed Models Tests for Two Means in a 3-Level Hierarchical Design (Level-2 Randomization) (3:46)

"PASS 13 is fantastic! Better than my new dishwasher and microwave combined."

Dr. Barbara Tabachnick, CSUN, Author

"Two reasons for choosing your product [PASS]: all-around methods and options + very good documentation."

Mika Kurkilahti, PhD