If im doing reseach on topic knowledge, attitude and practice regarding hepatitis B vaccination and plan to determine the correlation of knowledge with attitue and attitude with knowledge using pearson correlation.

a) Is there need to separate the knowledge , practice and attitude whether each one is independent or dependent variable in the research?

b) Is it necessary to categorize the scoring of knowledge , attitude and practice( for eg: caterogizing knowledge as adequate knowledge and poor knowledge on the basis of scoring or mean) to check for correlation?