[Rd] Inaccuracy in DFBETA calculation for GLMs

[Ravi Varadhan]

Hi,

I have been calculating sensitivity diagnostics in GLMs.  I am noticing that the dfbeta() and influence() functions in base R are inaccurate for non-Gaussian GLMs.  Even though the help says that the DFBETAs can be inaccurate for GLMs, the accuracy can be substantially improved.

I was thinking of writing this up along with a proper fix to R Journal but then started wondering whether this is a well-known issue and it has been addressed in other packages.

Has the inaccuracy of DFBETA been addressed already?

Thank you,
Ravi


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