I downloaded sensor data, but have found it difficult to retrieve the meaning of variable labels (I was not the one who coded these). I hope I could find help from this forum.
In the accelerometer data, what do “activity_type” and “confidence_level” mean?
In the screen-state data, what do “FALSE” and “TRUE” mean?
Thanks for your question. I think this part of our documentation can help you understand the variables in the exported data.
I should clarify that Accelerometer does not have activity_type nor confidence_interval. I believe you are referring to the “Activity Recognition” which is another data source.
The data shows when the phone was turned on (TRUE), and when it was turned off (FALSE). The time the phone was on and user was interacting with the device then will be:
sum of all (record[n + 1].time - record[n].time) given record[n].state = TRUE
Basically the duration from the next “turn off event” to the current “turn on event”.