Monday, December 8, 2025

More Post-Estimation Commands: Contrast

For those who include factor variables on the right-side of a regression equation, a more robust set of post-estimation commands in Stata unlocks additional information on, e.g., how various factor variable outcomes differ from, e.g., the factor variable's designated reference category. Stata's contrast command provides a set of contrast operators that make it easy to specify named contrasts such as reference-level contrasts, adjacent contrasts, Helmert contrasts, and orthogonal polynomial contrasts. For anyone interested, a Stata instructional video walks you through the basics (with a helpful on-line example, here) and additional information in included at UCLA's resource (click here).