plot.irtpwrresult: Plot Power Curves

In irtpwr: Power Analysis for IRT Models Using the Wald, LR, Score, and Gradient Statistics

Plot Power Curves

Description

Plot the power curves using the resulting object of the irtpwr function.

Usage

## S3 method for class 'irtpwrresult'
plot(x, bounds = NULL, ...)

Arguments

x	Object of class irtpwrresult as created by the irtpwr function.
bounds	integer vector. the first entry is the lower bound of the x-axis in the plot (sample size). The second entry is the upper bound. By default, these values are chosen to cover a power range of .5 to .95.
...	additional arguments to be passed.

Value

A ggplot object

Examples

library(mirt)
dat <- expand.table(LSAT7)
mirtfit <- mirt(dat,1,verbose = FALSE)
hyp <- setup.hypothesis(type = '1PLvs2PL', altpars = mirtfit)
res <- irtpwr(hyp=hyp,alpha=.05,power =.8)
plot(res)

irtpwr documentation built on Nov. 20, 2023, 5:07 p.m.