07-26-2017 10:34 AM
I have effective and expiration dates in a dataset where I have transposed them so all for the key I have created are in a single row in the dataset. I want to be able to compare all of the dates to see if there is a break in the dates. My end result should be if I can combine the dates in the row to make one effective date and one expiration date. I can't use MIN(Eff_Dt) or MAX(Exp_Dt) because I might miss breaks in the dates.
I have attached a few examples in an excel spreadsheet.
07-26-2017 10:44 AM
Welcome to the community. First, I advise to post anything you need to, test data and code directly into the post, I wouldnt download Office files from the net as security risk.
From what you post, I question the need to transpose the data to find missing periods:
data want; set have; if current_date ne lag(current_date)+1 then flag="Y"; run;
So in this example, the lag lookks back one record and if its not 1 day more than the lag value sets a flag. No need to transpose to do this.