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Stata | Margin plots
Home / Products / Stata 12 / Margins plots
Margins plots were introduced in Stata 12.
See the latest version of margins plots.
See the new features in Stata 18.
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Margin plots
New in Stata 12 is the marginsplot command, which makes it easy to graph statistics from fitted models.
marginsplot graphs the results from margins, and margins itself can compute functions of fitted values after
almost any estimation command, linear or nonlinear.
Suppose we've just fit a two-way ANOVA of systolic blood pressure on age group, sex, and their interaction.
We can estimate the response for each cell with margins:
To study the interaction it would be nice to see a graph. In Stata 12 we no longer have to construct the graph
manually; we can instead just type marginsplot:
https://www.stata.com/stata12/margins-plots/
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Stata | Margin plots
marginsplot automatically chooses the y-variable and x-variable and adds confidence intervals. We don't have to
stick with the defaults, though: marginsplot includes a rich set of options for changing axis definitions, labels,
curves, confidence intervals, and more.
marginsplot also supports the new features of the margins command, including the contrast operators. Let's
contrast women with men in each age group and plot the contrasts:
https://www.stata.com/stata12/margins-plots/
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Stata | Margin plots
We see that systolic blood pressure is lower in younger women than in younger men. But among the old, the
relationship is reversed, and women have higher blood pressure than men.
marginsplot works with nonlinear models, too. Suppose we've fit a logistic regression, modeling the probability
of high blood pressure as a function of sex, age group, body mass index, and their interactions. marginsplot can
contrast women with men on the probability scale:
. quietly margins r.sex, at(bmi=(10(1)65))
. marginsplot, xlabel(10(10)60) recast(line) recastci(rarea)
Variables that uniquely identify margins: bmi
https://www.stata.com/stata12/margins-plots/
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Stata | Margin plots
We've only scratched the surface—anything that margins can compute, marginsplot can graph.
Back to highlights
See New in Stata 18 to learn about what was added in Stata 18.
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