Hi,
I have a large dataset of 20000 rows that contains 180
individuals identified by a unique identification number. There are 5 columns
of data with health status data in each column, and a different number of rows
for each individual i.e. 5 rows for individual 1 and 20 rows for individual no.
2. I wish to extract the data from the first 3 rows for each individual and
then perform a data function for each individual....i.e. what is the average
blood pressure for individual 1 in the first 3 rows of their data?
I cannot seem to do this easily...any suggestions?
Regards
Dr Bruce Green