I have done a questionnaire with six questions to measure engagement. This is the only component I measure. To make sure they measure just one component, I tried to run a Factor analysis with Direct Oblimin. However, when I run the test it will not show a pattern matrix. (Is this because I have only one component? If yes, is this reliable enough to continue with a reliability analysis?). When I add a random variable it shows the pattern matrix with two components.
When I skip the Factor analysis and just start with a Reliability analysis: I increase my Cronbach's Alfa by deleting two items. My Cronbach's Alfa is .79 which should be fine for this experiment.