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Applied Analysis Note 7

Note 7: Draw an Item Characteristic Curve "by hand" using Stata

Here is some Stata code for a binary item ICC (do file)
Here is some Stata code for a categorical item ICC (do file)

Both of these examples use runmplus.

The examples also use Bayesian plausible values of the latent trait scores as "observed" latent trait levels to plot expected and model-implied proportions. It's a visual check on the fit of the model.

The procedure demonstrated converts Mplus parameter estimates to the 2PL metric. Details on the conversions we use can be found here (pdf, scroll down to page 11).

The plots below use a custom Stata scheme (rnj) which is linked below. Another scheme (rnjwbg) is similar but uses a white background.




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draw-icc-binary.do
(2k)
Rich Jones,
Jul 20, 2018, 3:17 AM
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draw-icc-ordinal-categorical.do
(3k)
Rich Jones,
Jul 20, 2018, 3:17 AM
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scheme-rnj.scheme
(10k)
Rich Jones,
Jul 20, 2018, 3:34 AM
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scheme-rnjwbg.scheme
(10k)
Rich Jones,
Jul 20, 2018, 3:34 AM
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