I am getting odd results from the bayesglm function in the ARM package.  Running R 3.0.2 and downloaded the most resent ARM package.  Every dataset I try runs, but the output is incorrect - I get a null deviance that is less than the residual deviance.  I have tested this with datasets I have used for a class many times before and know what the results should be, but get the same result - coefficients are different and the null deviance is less than the residual deviance.  I am not a Bayesian person - I just like to run this to compare to the standard GLM in logistic regressions.  Standard GLM works fine and gives same/similar results as I have gotten in the past with the test data, but the bayesglm does not.  Any suggestions?

Peter Harrell
Faculty Instructor
NSOE Duke University
A224 LSRC Building
919.613.827


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