Statview is a statistics package made for the mac.
Here's a link to Wikipedia's summary thereof, which may shed some light on why I like it so much. It is (or rather, was) used primarily by people doing complex statistical analyses - inferential and predictive analytics on databases with human subjects. In short: social scientists.
Unfortunately, there is no comparable application that picks up where it left off.
Statview was a property of Abacus corporation until it was purchased by SAS in 1997. In 2001, SAS phased it out in favor of JMP, which is more expensive, more complex, and less user-friendly. It's a good program, mind you; I just happen to like Statview a lot better. JMP is much more like the advanced stat packages SAS and SPSS in ways I don't like - statview had all their power without being complex, arcane, and overpriced.
I own JMP - but I don't like it. Excel is simply not cut out for the kinds of analyses I want to run. Thus, I have concluded, my best solution is to go back to statview -- as long as I can find a way to process the data with reasonable speed and without overloading my machine.