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.
Level parameters. The input-level parameter Li (upper panel) represents the position of the two-slope breakpoint along the x axis, while the output-level parameter Lo (lower panel) represents the position of the two-slope breakpoint along the y axis.
