I am using the Harvard Trauma Questionnaire (HTQ) Trauma Events scale (original version) that has 17 items (17 different traumatic events) with 4 response options, indicating 4 levels of exposure: experienced, witnessed, heard about it, and no. In SPSS, I have already coded each of the 17 items with the following value labels: .00 = No, 1.00 = Heard about it, 2.00 = Witnessed, 3.00 = Experienced.
I want to calculate a categorical variable by counting all the positive responses on each of the four categories of responses to produce a total number of events experienced, total number of events witnessed, total number of events heard about, and so on.
Because I want to differentiate between direct and indirect exposure, I also want to calculate the total number of events by counting as 1 any response other than 'no' and 'heard about it,' which would mean that I would need to create a dichotomous dummy variable.
In order to do the above, do I need to create two additional variables for Part 1 of the HTQ? If so, how do I go about doing this in SPSS? Any guidance would be greatly appreciated.