My study has 50 questionnaires with 5 point Likert scale. The questionnaire contains 7 categories, and each category has 9 questions. How do I combine the 9 different items into one variable, so that I will have 7 variables?
How can I combine different items into one variable with SPSS?
I don’t think, you should use SPSS. Instead, Confirmatory Factor Analysis (CFA) can be used to group all the items into one variable. With the help of this method, each item would stand by itself independently.
You can calculate the mean with all these questions. With its help, you will have a new variable. Now, you can use this new variable in your study to move forward.
Moving further, just check whether the measurements are summative or not. I am asking you to do this because sometimes, you are not allowed to compute the total score for some variables. And, if the questionnaire in your study permits, then, you can calculate the total score by
transform> compute variable> set the target variable TOTAL and set in the numeric expression box sum (item1 to item48) > ok