howto install and start pspp on mac / apple (succesful tested on yosemite)

The following programs need to be installed first:
1. x11
2. xCode
3. Macports

Here you can download pspp for free.

If you have installed the mentioned programs, you install pspp as follows:
1. start x11
2. tipe the following command into xterm and execute it with the enter-button:

sudo port install pspp

 (it takes a while, so you can do a short workout)
After installation you can start the graphical-interface as follows:
3. start pspp in xterm with the command

psppice

Have fun