Hi all, Does anyone know whether there was a change to the algorithm of the glm function between versions 3.4.0 and 3.5.1 of the stats package? I noticed the introduction of the 'singular.ok' option, but I'm seeing more fundamental differences in the output of Generalised Linear Models between the two versions, particularly when the models don't converge.
In the later version, I'm seeing more variables 'blowing up' and giving large or NA standard error values when a model doesn't converge, but I'm using the same value of 'maxit' for both versions. The numerical precision seems to be the same in versions 3.4.0 and 3.5.1 of R, as far as I can tell, but perhaps there is some difference that is indirectly affecting glm? Alternatively, there is a C function named Cdqrls that is called by glm, and I wondered if this had changed? I have rather limited control over the version of R that I use, so I'm hoping I can produce results with 3.5.1 that are as similar as possible to those of 3.4.0. Many thanks, Mark Purver Statistician, UK Ministry of Justice ________________________________ This e-mail and any attachments is intended only for the attention of the addressee(s). Its unauthorised use, disclosure, storage or copying is not permitted. If you are not the intended recipient, please destroy all copies and inform the sender by return e-mail. Internet e-mail is not a secure medium. Any reply to this message could be intercepted and read by someone else. Please bear that in mind when deciding whether to send material in response to this message by e-mail. This e-mail (whether you are the sender or the recipient) may be monitored, recorded and retained by the Ministry of Justice. Monitoring / blocking software may be used, and e-mail content may be read at any time. You have a responsibility to ensure laws are not broken when composing or forwarding e-mails and their contents. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
