Can you merge data from two time points within the same data set? I have a single data set with variables from two separate time points. I am supposed to analyse these but have been asked to merge the variables so that the data from both time points can be traced back to each other. Is this possible?
One way i thought would be to create separate data files for both time points then merge the observations. Would this work? Or can we merge variables from the same data set?
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