Is there a free statistical software other than PAST software ?

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Which statistical test should we use?

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Chemache Loucif

Hello, y ou can find 'R'.

Hamed Majidzadeh

I would say "R" does a pretty good job on that, and if you search for packages you can find even the codes for free online

Jennifer Doering

I also recommend using R. The graphs it produces are very good quality, and you can modify the layout using basic code functions, which are easily found online or in the R graphics book:

https://www.stat.auckland.ac.nz/~paul/RG2e/

http://www.amazon.com/Graphics-Second-Edition-Chapman-Series/dp/1439831769

http://www.r-project.org/

Andrew Koster

If you don't like R, Python has some decent stats libraries with scipy, and matplotlib is by far my favourite library for graphing pretty much anything.