While similar in some respects, the key difference between panel data and pooled cross-sectional data is that pooled cross sections generally consist of ___ individual cross-sectional units that are tracked over time. This is not the case with panel data. the same following is true regarding pane(longitudinal) data sets? Check all that apply. different hving several observations on the same cross-sectional members enables a researcher to control for unobserved characteristics Which of the following is true regarding panel (longitudinal) data sets? Check all that apply. O Having several observations on the same cross-sectional members enables a researcher to control for unobserved characteristics. O They do not track the same cross-sectional members over a period of time. O Panel data sets are easier to clean and manipulate because they typically have fewer observations than other types of data. O Panel data sets enable researchers to see the effects of a policy decision.