Displaying 1 result from an estimated 1 matches for "tp4305651p4319303".
2012 Jan 18
2
Extracting rows with latest date from a data frame
Hi,
I have a list of unique patient IDs which I want to run against a dataframe
of unique patient IDs with dates. There are multiple date instances against
unique IDs. The end result I wish is that I have a list of IDs (which are
unique) with the latest date. I have begun with using test data (but I
haven't got very far!)
#Create test data
#Data frame creation