Hi aeh,
Thanks for thinking along.
Earlier in this old thread, StatGuru explains how to to calculate the FSIQ for the WISC IV from the the sum of the scaled scores using this formula
FSIQ = 25 + 0.75*S where S is the Sum of Scaled Scores.
(And he/she explained: "The Sum of Scaled Scores is the sum of the 10 Subtest Scaled Scores. Each Subtest Scaled Score ranges from 1-19 with a mean of 10 and a standard deviation of 3. Each is assumed to be normally distributed. The Sum of Scaled Scores follows a normal distribution with a mean of 100 and a standard deviation of 20. The only difference between the Sum of Scaled Scores and the FSIQ is that the FSIQ has a standard deviation of 15 (not 20). You can easily convert from one normal distribution to another, so if you know the Sum of Scaled Scores, you know the Full Scale Composite Score (FSIQ):
FSIQ = 100 + ((15/20)*(S-100)) <- same as above, before simplication
The 100's are the means of the two distributions and the 15 and 20 are their standard deviations. All of this can be obtained by publically released information.)
I would like to know how to calculate a FSIQ from the sums of the scaled scores on the WISC V. Basically, because I was wondering what FSIQ a sum of scaled scores of 114 on WISC V would translate to.)
