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pid1
2005 May 18
1
from list to dataframe
I was wondering if someone can help me figure out the following:
I have two patient datasets, ds1 and ds2. ds1 has fields "patid", "date",
and "lab1". ds2 has "patid", "date", and "lab2". I want to find all the
patids that have at least 2 dated records for each lab. I started by
splitting each dataset by patid, to create ds1.list