I have a dataset called California Health Interview Survey (CHIS), a state survey. I have some trouble starting the data management and cleaning process. The data provides formatted data and regular SAS data files. I wondered if there is an efficient way of filtering your data to the variable of interest (I have to refer back to the codebook many times) and pooling previous survey years? Since this is survey data, I also have to keep weights and ranks in mind. It has been a while since I worked with big data (my last attempt was BRFSS).   Thank you! ... View more