when to use a panel time series regression when should i use panel time period regression when do you use a panel time series in regression when to use panel time series regression when to use panel time series regression when to use panel time series regression when to use panel regression what type of regression is used to show independent and dependent variables what is the difference between panel time series vs. unrelated regression? why is sur used when to use a panel timeseries regression when to use paneltime series regression can you use a period regression instead of a time series regression? when do you use regression or fixed effect why use time series regression when to use panel time series how to do regression panel time series when to use panel time series regression is a time series regression unrelated when do i use an unrelated regression