Android Phone Sensors Missing Data

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it is not allowed to determine if OUTGOING messages ids are contacts (as far as we are aware, seems to be an API limitation)

see: source code https://github.com/RADAR-base/radar-android-phone/blob/master/src/main/java/org/radarcns/phone/PhoneLogManager.java#L260-L285

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Some of the contacts will later be know because the same hash value is seen in INCOMING, it may at that point be possible to add populate a TRUE value into some of the messages that previously were OUTGOING. See the image attached to the issue

FITBIT DATA Anomalies

Sleep stages Unknown

a bug in the sleep stage mapping, where the "wake" sleep stage is mapped to "UNKNOWN". So during analysis, any UNKNOWN sleep stage can be mapped to AWAKE.