irtoys: plot.tif – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

plot.tif

A plot method for test information functions

Useful for plotting test information functions. The x argument of tif should better be left out unless something special is required.

## S3 method for class 'tif'
plot(x, add = FALSE, main = "Test information function",
  co = 1, ...)

`x`	An object produced by function `tif`
`add`	When `add=T`, the TIF is added to a plot, otherwise a new plot is started. Default is F.
`main`	The main title of the plot, given that `add=F`.
`co`	The colour of the TIF curve. Default is 1 for black. Use `co=NA` to plot each TIF in a different colour.
`...`	Any additional plotting parameters

Ivailo Partchev

plot(tif(Scored2pl))

A Collection of Functions Related to Item Response Theory (IRT)

v0.2.1

GPL (>= 2)

Authors

Ivailo Partchev [aut, cre], Gunter Maris [aut], Tamaki Hattori [ctb]

Initial release

2017-12-15