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.
Blue line is the grand mean of estimates of each parameter. Parameter a is the y-intercept of line 1, parameter b is the slope of line 1, parameter c is the slope of line 2 and parameter d is the breakpoint separating line 1 and line 2.
