I'm formulating a questionnaire about recycling behaviour for my school's research project and I want to use the questionnaire to do relationship analysis between different variables or factors that influence recycling behaviour. So in my questionnaire there are sections asking about attitude towards recycling, recycling behaviour, obstacles to recycling etc. But since different sections ask questions differently and therefore have different scales (e.g section 1: 5 point likert scale, section 2: 4 point likert scale, section 3: choose options from A to E) Can I do relationship analysis with questions that have different scales? I'm especially concerned about whether my analysis is valid when comparing likert scale quesitons with categorical questions (choose A-E options).
You can do relationship analysis with quantities that have different scales but for the results to be highly accurate you would have to normalize/standardize your data. Normalizing is converting all your analysis inputs to the same scale.
You can convert categorical values A-E to numerical values that make sense before your analysis.
Hope this helps.