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gertjanssenswillen / edeaR

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activity_frequency(level = "activity") vs n_events() #13

Closed Nipi closed 6 years ago

Nipi commented 6 years ago

Hello Gert,

I'm using the activity_frequency (level = "activity") and n_events ().

What I see is that n_events () has twice the number of events compared to activity_frequency (level = "activity") (perhaps due to the start/full state).

Thank you.

gertjanssenswillen commented 6 years ago

Hi

This is expected if each activity instance has a start and complete timestamp. Note that an "event" is different from an "activity_instance": an event is atomic (has only one timestamp); an activity instance can be related to multiple events and can have a duration.

The information in activity_frequency should correspond with the output of n_activity_instances.

It can be that each activity instance has only one event, in which both quantities you mention will be equal, but this is not necessarily the case.

Nipi commented 6 years ago

Thanks Gert.