= Stata Margins = The '''`margins`''' command reports expected values from a model. <> ---- == Usage == Adapted from [[https://www.stata.com/links/stata-basics/margins-marginsplot-interaction-two-categorical-predictor/|here]]: {{{ . webuse nhanes2l (Second National Health and Nutrition Examination Survey) . regress bpsystol i.hlthstat##i.diabetes Source | SS df MS Number of obs = 10,335 -------------+---------------------------------- F(9, 10325) = 86.92 Model | 396524.045 9 44058.2272 Prob > F = 0.0000 Residual | 5233449.31 10,325 506.871604 R-squared = 0.0704 -------------+---------------------------------- Adj R-squared = 0.0696 Total | 5629973.35 10,334 544.800982 Root MSE = 22.514 ------------------------------------------------------------------------------------- bpsystol | Coefficient Std. err. t P>|t| [95% conf. interval] --------------------+---------------------------------------------------------------- hlthstat | Very good | 2.636051 .6417076 4.11 0.000 1.37818 3.893922 Good | 7.648725 .6272209 12.19 0.000 6.419251 8.8782 Fair | 13.50647 .7408272 18.23 0.000 12.0543 14.95863 Poor | 14.77223 1.032484 14.31 0.000 12.74837 16.7961 | diabetes | Diabetic | 5.780232 4.618696 1.25 0.211 -3.273308 14.83377 | hlthstat#diabetes | Very good#Diabetic | 17.43339 5.726714 3.04 0.002 6.207924 28.65886 Good#Diabetic | 4.023894 5.032308 0.80 0.424 -5.840404 13.88819 Fair#Diabetic | 7.316062 4.97969 1.47 0.142 -2.445096 17.07722 Poor#Diabetic | 3.445358 5.09316 0.68 0.499 -6.538222 13.42894 | _cons | 124.2614 .4611975 269.43 0.000 123.3574 125.1655 ------------------------------------------------------------------------------------- . margins i.hlthstat#i.diabetes Adjusted predictions Number of obs = 10,335 Model VCE: OLS Expression: Linear prediction, predict() ----------------------------------------------------------------------------------------- | Delta-method | Margin std. err. t P>|t| [95% conf. interval] ------------------------+---------------------------------------------------------------- hlthstat#diabetes | Excellent#Not diabetic | 124.2614 .4611975 269.43 0.000 123.3574 125.1655 Excellent#Diabetic | 130.0417 4.595612 28.30 0.000 121.0334 139.05 Very good#Not diabetic | 126.8975 .4461899 284.40 0.000 126.0229 127.7721 Very good#Diabetic | 150.1111 3.356161 44.73 0.000 143.5324 156.6898 Good#Not diabetic | 131.9102 .4250916 310.31 0.000 131.0769 132.7434 Good#Diabetic | 141.7143 1.952195 72.59 0.000 137.8876 145.541 Fair#Not diabetic | 137.7679 .5797601 237.63 0.000 136.6315 138.9043 Fair#Diabetic | 150.8642 1.768852 85.29 0.000 147.3969 154.3315 Poor#Not diabetic | 139.0337 .9237528 150.51 0.000 137.2229 140.8444 Poor#Diabetic | 148.2593 1.93768 76.51 0.000 144.461 152.0575 ----------------------------------------------------------------------------------------- }}} ---- == See also == [[https://www.stata.com/manuals/rmargins.pdf|Stata manual for margins]] ---- CategoryRicottone