plot.tif {irtoys} | R Documentation |
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
data(Scored) p.2pl <- est(Scored, model="2PL", engine="ltm") plot(tif(p.2pl))