Panel studies come in all forms.
Panel studies can involve data collection at widely differing intervals, varying anywhere from a day to several years. Also, data collection may be carried out utilizing various methodological approaches. In discussing different types of panel operations, we should make the distinction between static and dynamic panels. A static panel is one where no attempt is made to rotate the panel members during the life of the panel. A dynamic panel rotates panel members to maintain the sample as representative of the population.