robmed (version 0.4.0)

plot_mediation: Plot (robust) mediation analysis results

Description

Produce dot plots of selected coefficients from regression models computed in (robust) mediation analysis, or density plots of the indirect effect.

Usage

plot_mediation(object, ...)
# S3 method for boot_test_mediation
plot_mediation(object, method = c("dot",
  "density"), parm = NULL, ...)
# S3 method for sobel_test_mediation
plot_mediation(object, data,
  method = c("dot", "density"), parm = c("c", "ab"), level = 0.95,
  ...)
# S3 method for list
plot_mediation(object, data, method = c("dot", "density"),
  parm = NULL, level = 0.95, ...)
# S3 method for default
plot_mediation(object, mapping = attr(object,
  "mapping"), facets = attr(object, "facets"), ...)
# S3 method for test_mediation
autoplot(object, ...)
# S3 method for test_mediation
plot(x, ...)

Arguments

object, x

an object inheriting from class "test_mediation" containing results from (robust) mediation analysis. For plot_mediation, a list of such objects may be supplied as well.

…

additional arguments to be passed to and from methods.

method

a character string specifying which plot to produce. Possible values are "dot" for a dot plot of selected coefficients, or "density" for a density plot of the indirect effect(s).

parm

a character string specifying the coefficients to be included in a dot plot. The default is to include the direct and the indirect effect(s).

data

an optional numeric vector containing the \(x\)-values at which to evaluate the assumed normal density from Sobel's test (only used in case of a density plot). The default is to take 100 equally spaced points between the estimated indirect effect \(\pm\) three times the standard error according to Sobel's formula.

level

numeric; the confidence level of the confidence intervals from Sobel's test to be included in a dot plot. The default is to include 95% confidence intervals.

mapping

an aesthetic mapping to override the default behavior (see aes or aes_).

facets

a faceting formula to override the default behavior (only used in case of a dot plot). If supplied, facet_wrap or facet_grid is called depending on whether the formula is one-sided or two-sided.

Value

An object of class "ggplot" (see ggplot).

See Also

test_mediation, fortify

Examples

# NOT RUN {
data("BSG2014")

# run fast and robust bootstrap test
robust_boot <- test_mediation(BSG2014,
                              x = "ValueDiversity",
                              y = "TeamCommitment",
                              m = "TaskConflict",
                              robust = TRUE)

# create plots for robust bootstrap test
plot(robust_boot, method = "dot")
plot(robust_boot, method = "density")

# run standard bootstrap test
standard_boot <- test_mediation(BSG2014,
                                x = "ValueDiversity",
                                y = "TeamCommitment",
                                m = "TaskConflict",
                                robust = FALSE)

# compare robust and standard tests
tests <- list(Robust = robust_boot, Standard = standard_boot)
plot_mediation(tests, method = "dot")
plot_mediation(tests, method = "density")

# }