Re: [R] things that are difficult/impossible to do in SAS or SPSSbut simple in R

From: hadley wickham <h.wickham_at_gmail.com>
Date: Fri, 18 Jan 2008 14:07:49 -0600

On Jan 18, 2008 1:19 PM, Jeffrey J. Hallman <jhallman_at_frb.gov> wrote:
> Frank E Harrell Jr <f.harrell_at_vanderbilt.edu> writes:
>
> > Rob Robinson wrote:
> >> I wonder if those who complain about SAS as a programming environment have
> >> discovered SAS/IML which provides a programming environment akin to Matlab
> >> which is more than capable (at least for those problems which can be treated
> >> with a matrix like approach). As someone who uses both SAS and R - graphical
> >> output is so much easier in R, but for handling large 'messy' datasets SAS
> >> wins hands down...
> >> Cheers
> >> Rob
> >
> > My understanding is that PROC IML is disconnected from the rest of the
> > SAS language, e.g., you can't have a loop in which PROC GENMOD is called
> > or datasets are merged. If that's the case, IML is not very competitive
> > in my view.
>
> I know about IML, but have never really used it. Back when I was doing that
> kind of stuff (before discovering S-Plus) I used GAUSS for compute-intensive
> matrix simulations and the like. I didn't have SAS for my PC, and there was
> no way I could tie up the Sun boxes at work with simulations for my thesis.
>
> But while IML does some nice stuff, it just reinforces the point I made in
> another post about the proliferation of "little languages" in SAS. By my count,
> that are now 5:
>
> 1. data step programming
> 2. macros -- a 'language' grafted on top of data step programming
> 3. scl -- if you want to do any kind of user interface
> 4. af -- object-oriented framework built on top of scl
> 5. iml -- matrix language like GAUSS, but doesn't play well with 1:4 above.

6. the "proc" language

Hadley

-- 
http://had.co.nz/

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