Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
One-sided probabilities of significance for a test of the difference between two groups A and B at 2-years with mean Δ2 = μa2 − μb2 under the null and the alternative hypotheses (Δ2 = 0 or 1, respectively), for n = 200 per group with 30% missing that are replaced by values at 1-year with mean difference Δ1 = μa1 − μb1 ranging from −1 to 2 and variance σ2 = 20 within each group at both times. The correct probabilities with no missing data are designated by the dots.
