Now Playing: NCSS Quick Tips 2 (3:45)

"I have used NCSS since it was NCSS 2000. Absolutely love it."

Dr. William Kennedy, Consultant

"PASS is a great program. It does so much and is easy to use. It’s much better than the other sample size programs I’ve used—it has helped me greatly in my research."

Ken Lawson, Ph.D., The University of Texas