I am using different Likert Scales in questionnaire. Three dependent variables have Likert scales of 4 points, 2 points and 2 points. Three independent variables have 3 points scales. One moderating variable has 3 points Likert Scale whereas the other moderating variable has three questions with 4 points, 3 points and 3 points scales. If I use average of each variable in statistical analysis to find correlation, regression and moderated regression, is it allowed and results are considered valid or not?