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When there are no calls and no smses (of a particular type), the ratio is undefined. But since their number is the same, I argue that the ratio can represent that with a 0.5, similarly to the case where no_calls_all = no_sms_all != 0.
|10 months ago|
|example_esm.csv||1 year ago|
|example_proximity.csv||10 months ago|