Prof Brian Ripley wrote:
> I would not have expected glm to be more than say 5x slower than lm if
CPU
> cycles and not memory were the limiting factor. In that case more RAM
> might be all you need.
The ratio between glm and lm might well be about 5x, but that's still a
big difference for us.
Prof Brian Ripley wrote
> Probably not, but you have the ability to profile in R and find out.
Thanks. This is certainly something I could check, and I shall do so.
>
>
> Some more comments;
>
> 1) The Fortran code that underlies glm is that of lm.fit that only makes
>use of level-1 BLA
Peter Dalgaard wrote
> Is this floating point bound? (When you say 30 factors does that mean
> 30 parameters or factors representing a much larger number of groups).
> If it is integer bound, I don't think you can do much better than
> increase CPU speed and - note - memory bandwidth (look for larg
Hello,
at the moment I am doing quite a lot of regression, especially
logistic regression, on 2 or more records with 30 or more
factors, using the "step" function to search for the model with the
smallest AIC. This takes a lot of time on this 1.8 GHZ Pentium
box. Memory does not seem t
