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.
Simulated power versus mean difference with µc = 9. The multiplicative errors, ηijc and ηijt, are independently drawn from a t-distribution t(3) and the additive errors, εijc and εijt, are independently drawn from a t-distribution t(3) for Model IV and from a normal distribution N(0,0.3) for Model I and II.
