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.
Hypothetical logistic regression model of y = agreement with an explanatory variable x. The open circles represent observed values of x for y = 1 (agreement) and y = 0 (disagreement). The line represents the modelled relationship, and the shaded band is 95% confidence interval. Complete (or nearly so) separation would occur if the observations at y = 0, x > 0.375 (outside confidence interval band) were removed, requiring Firth (1993) adjustments to derive reliable parameter estimates.
