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How to calculate the time spent at location for each unique ID per day?

I’m currently working on the smartGPA dataset (https://studentlife.cs.dartmouth.edu/smartgpa.pdf) and I was trying to calculate the time spend studying at a location at each day for each student (UID) to eventually get a mean study time for each student. I have timestamp data and location data for each student based on wifi location data. For example, […]