A clinical psychologist was interested in the effects of cognitive behavior therapy (CBT) on OCD. She compared people with OCD after sessions of CBT or behavior therapy (BT) with a group who were awaiting treatment (a no treatment condition, NT). Most psychopathologies have both behavioral and cognitive elements to them. For example, for someone with OCD who is obsessed with germs and contamination, the disorder might manifest itself in the number of times they both wash their hands (behavior) and think about washing their hands (cognition). To gauge the success of therapy, it is not enough to look only at behavioral outcomes (such as whether obsessive behaviors are reduced); we need to look at whether cognitions are changed too. Hence, the clinical psychologist measured two outcomes: the occurrence of obsession-related behaviors (Actions) and the occurrence of obsession-related cognitions (Thoughts) on a single day.

Using dataset OCD.sav