Descriptive Research analysis : It can be divided into two classes:
a. Panel Analysis Longitudinal Study
b.Cross Sectional Analysis Study a. Longitudinal Studies: Longitudinal studies are based on panel data and panel methods. A panel is a sample of respondent who are interviewed and then reinter viewed from time to time: generally panel data relate to the repeated measurements of the same variables. Each family included in the panel, records it purchases of a number of product at regular intervals say weekly monthly or quarterly. Over a period of time such will reflect change in the buying behaviour of families.Panel Analysis can be further divided into two categories: a.Traditional Panel - Where measurements of the same variables is made repeatedly at different points of time.
b.Omnibus Panel - Where the information is collected from each of the sample member varies each time.