Hi, i am trying to calculate RCI for individual parental stress scores and am having a bit of trouble determining Sdiff (standard deviation of the group baseline-follow up scores).
Is Sdiff = square root of 2(group baseline- group followup)2 ?
The formula I am trying to use is on pg14 of this article:
Jacobson, N. S., & Truax, P. (1991). Clinical significance: a statistical approach to defining meaningful change in psychotherapy research. Journal of consulting and clinical psychology, 59(1), 12.
Thanks
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