iiaplot_4: Illustrated interaction plot 4

In schmettow/betaplot: Visualizing linear models

Description

plots a diagram for a linear model with one dichtotomous group and a metric predictor

Usage

iiaplot_4(fixef = list(b_0 = 0, b_1 = -8, b_2 = 1, b_3 = 2), range = c(0,
  10), groups = c("A", "B"), label = c("covariate", "outcome"))

Arguments

fixef	list of four coefficients b_0 - b_3, see Details
range	a vector of two values c(xmin, xmax)
groups	a vector of two strings, like c("A", "B")
label	vector of strings ("covariate", "outcome") This function plots a standard interaction diagram for a model with one covariate and two groups. This model has the following parameters: b_0 is the intercept, the expected value of the reference group, i.e. the first element in argument groups ("A"). b_1 is the grand difference towards the second group (b_2 = 0) b_2 is the slope of reference group b_3 is the interaction effect, which is the difference in slope towards the reference group The parameters can also be given as an unnamed list, as long as the elements comply to the order. The line plot is augmented with illustrations, showing the two group effects b_0 and b_1 as vertical bars and the slope parameters as triangles.

Author(s)

Martin Schmettow

Examples

iiaplot_1(fixef(b_0 = -2, b_1 = 1, b_2 = 1.5, b_3 = 1))

schmettow/betaplot documentation built on May 29, 2019, 3:41 p.m.