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Hey, I have just finished running all the regressions for my thesis and I now have a nice 8-variable regression with an r² if 0.53. Almost all my hypothezised variables are significant. I am now wodering if there is a possibility to somehow test the forecasting accuracy of this model? I am using SPSS, is there anything that comes to mind? I just wanna say something like: here is the printout, all is significant. Here is the forecasting equation, coefficients 1 though 8 do blablabla, forcasting accuracy is X. Is that possible?