I use Systat and Statistica, both of which run in classic. Unfortunately, neither program has been updated in years for the Mac (new Windows versions are available). I particularly like the way Systat operates except for the klunky data module (fixed in Windows of course), but I don't know if you can even buy it now (SPSS now owns them). A colleague uses JMP as is very happy with it. There is an OS X version for it and a demo, which can be downloaded from here.
G4/1.3 ghz Cube, 20" iMac 2.16 ghz Core 2 duo, 1.42 mhz Mini, G4/1.33 15" AI PowerBook, G3/400 Pismo
Back "then", I would enter the 1500 or so records, each with 50-75 observation. Push the button, and go home for the night. All that cranking away on a 25Mhz 040 machine.
I was using the Mac version of SPSS in those days, too. When the situation called for serious number-crunching, though, I had access to another computer, an Amdahl 6360 mainframe, which also used SPSS. Nowadays, I'll bet that my humble G4 has more number-crunching power than that ol' mainframe. Times change!
Cheers :-. Bill
__________________ "I don't know the key to success, but the key to failure is trying to please everybody."
- Bill Cosby