this is from BIST0535.hw3_1
As you can see I have sorted data by subject and then dov, such that the observations for a single subject are all clumped together and the observation from the first time they visited (date of visit, dov) is first. I need to create a new data set BIST0535.hw3_2 which contains only one observation from each subject with the first time they visited. I think we are meant to use an IF THEN statement, however if there is a easier way I am open to it.
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