I work on health care claims and right now I have a task to determine if any date ranges for a single patient overlap and I need to count the number of overlapping days for each date range for that patient. Here is the snap shot of the data. Also for the overlapping days I need to calculate the total dosage and also calculate the average dose for those overlapping days. Any help is greatly appreciated.
Use the lag() function to retrieve the enddate of the previous observation, and compare that with the filldate of the current obs.
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