Longitudinal data occurs when repeated measures are taken from the same subject over a short period of time. It used to be known as panel data as well, but in the recent years, some fields started to distinguish these two terms. Recently, some researchers use the term longitudinal when data are collected for 3 to almost 12 time points; while they use the term panel when there are almost 20 to 50 time points. This course is intended to introduce students with exploratory and confirmatory analysis of longitudinal data. Students will be able to analyze such complex data structures, which bears within subject correlations, in the future.