Monday, January 02, 2006

st: Update to -rrlogit- on SSC

Thanks to Kit Baum, an update to the -rrlogit- package is available from the SSC archive. To install the update, type

. ssc install rrlogit, replace

-rrlogit- fits logistic regression for randomized response data.

Major changes:

o Individually varying probabilities of unconditional answers can now be taken into account.

o I accidentally omitted a constant term in the log likelihood function. This had no implications for the estimated coefficients, but the reported log likelihood values were wrong. This is fixed.

o The baseline (constant only) model was estimated incorrectly. Thus, a wrong value for the overall Chi2-Test was reported. This is fixed.


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