Thanks for your quick answer. OK I found something in the stuff you told me for inspection. This is kind of a manual how to calculate the D-Score.

COMPUTE Numerator_for_D = (Mn2 - Mn1) .

COMPUTE Denominator_for_D = SQRT( ( ((N1-1) * SD1**2 + (N2-1) * SD2**2)

+ ((N1+N2) * ((Mn2-Mn1)**2) / 4) ) / (N1 + N2 - 1) ) .

COMPUTE D = Numerator_for_D / Denominator_for_D .

I think I try that one out. Yet I don't understand the N1 and N2 in this formula. This should be the sample size. But why is there and N1 N2. Yes, ok the Sample Sizes you calculate the two means of but they are the same, aren't they? N1 is equal to N2 because it is a paired sample you got here. So I am not sure if I am right when inserting the same values for N1 and N2...[:^)]

And I also don't understand what the double **means...