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Hello I have a small problem with filled contour plots. I'd like to plot point on top of that using points(). Trouble is, the x axis of the contour plot is modified to make room for the legend but...
I have just submitted irtoys_0.1.0, a package potentially useful for those working with IRT models. It can fit the 1PL, 2PL, and 3PL models through a simple and unified syntax, using either the R package ltm, Brad...
A new version of irtoys is / will be available on CRAN. Two minor bugs have been fixed. One of these is more interesting: the previous code did not anticipate negative estimates for discriminations. What I did not know is that...
I have just submitted irtoys_0.1.0, a package potentially useful for those working with IRT models. It can fit the 1PL, 2PL, and 3PL models through a simple and unified syntax, using either the R package ltm, Brad...
A new version of irtoys is / will be available on CRAN. Two minor bugs have been fixed. One of these is more interesting: the previous code did not anticipate negative estimates for discriminations. What I did not know is that...
This may have been answered before, but a nice possibility to plot the Titanic data is offered by "mosaic plots", as introduced (I think) by John Hartigan and implemented in the VCD package Ivailo Partchev Jena Marc Schwartz wrote: >On...
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