Berk Celikag wrote:

Other than that I'd agree with David to implement R aswell or something like SPSS (I don't know if there is an free analogue to it in linux) which might be more user-friendly for people who are not so familiar with statistics.

I've been using GNU PSPP which is very much like SPSS in many ways. So far, I've made fairly heavy use of descriptives and crosstabs, and I've done some recoding of variables. Many things are reminiscent of SPSS, so if you're familiar with that, GNU PSPP is fairly intuitive to navigate. A lot of the bells and whistles appear missing that you might be familiar with in SPSS. Copying individual tables and graphs from the output seems to be among the more annoying (at least I haven't figured out how yet) but I've been able to do a pretty descent screenshot that I cropped and the tables and graphs are fairly easy to replicate once you have the output when you're doing some simpler things.

I've yet to try any sort of regression (OLS, linear, etc.). All in all, I really like GNU PSPP. Especially when you consider the many hundreds of dollars IBM now wants for SPSS. It's ridiculous.

if you install via apt (sudo apt-get install pspp) you'll find it under Applications ->Education ->Subjects ->Math and Science if you're using Mate. Not sure where it might go under other desktop environments, but it's probably somewhere similar.