Problem
Given a sample dataset of user click events in tabular format, write a script to aggregate click-through rates grouped by device type and campaign ID.
Practicing as: Data Scientist interview at IterableHi, I'll play your Iterable interviewer for the Data Scientist role. Candidates describe these interviews as mostly positive and moderately difficult, so expect me to be friendly and conversational. Take your time with the question above and answer like we're in the room.
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