[Rd] Inaccuracy in DFBETA calculation for GLMs

Ravi Varadhan
Sat, 04 Oct 2025 13:34:48 -0000

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


	[[alternative HTML version deleted]]