NEWS

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irtoys 2.2

Fixed the name of the vignette in the vignette index entry

irtoys 2.1

Nothing, really, except that I had to provide new links to the ICL files as a result of Dropbox's new policy on shared files. God bless Brad's beautiful soul, 15 years dead and still helping us

irtoys 2.0

• Added functions to estimate and plot the interaction model
• Added erf, a function to plot the empirical item response function
• Added ssm, a function to produce IRF in the sum score metric
• Added ifp, a function to plot IRF with error bounds.
• Small improvements in the tia function
• Links to download Brad Hanson's ICL program (see the package help page)

irtoys 0.1.7 (2014-01-23)

NEW FEATURES

• new function, tet(), to calculate, quickly, an approximate matrix of tetrachoric correlations.

BUG FIXES

• fixed a bug in function wle() which affected the variance of Warm's weighted estimate of ability in the case of the 3PL model only.