Point-range plot of average marginal effectsSource:
ggplot2 package to draw a point-range plot of the average marginal effects computed by
# S3 method for marginaleffects plot(x, conf_level = 0.95, ...)
An object produced by the
numeric value between 0 and 1. Confidence level to use to build a confidence interval.
Additional arguments are passed to the
predict()method supplied by the modeling package.These arguments are particularly useful for mixed-effects or bayesian models (see the online vignettes on the
marginaleffectswebsite). Available arguments can vary from model to model, depending on the range of supported arguments by each modeling package. See the "Model-Specific Arguments" section of the
?marginaleffectsdocumentation for a non-exhaustive list of available arguments.
tidy function calculates average marginal effects by taking the mean
of all the unit-level marginal effects computed by the
The standard error of the average marginal effects is obtained by taking the mean of each column of the Jacobian. . Then, we use this "Jacobian at the mean" in the Delta method to obtained standard errors.
In Bayesian models (e.g.,
brms), we compute Average Marginal
Effects by applying the mean function twice. First, we apply it to all
marginal effects for each posterior draw, thereby estimating one Average (or
Median) Marginal Effect per iteration of the MCMC chain. Second, we take
quantile function to the results of Step 1 to obtain the
Average (or Median) Marginal Effect and its associated interval.