59 lines
4.6 KiB
Markdown
59 lines
4.6 KiB
Markdown
# Phone Screen
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Sensor parameters description for `[PHONE_SCREEN]`:
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|Key | Description |
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|----------------|-----------------------------------------------------------------------------------------------------------------------------------
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|`[TABLE]`| Database table where the screen data is stored
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## RAPIDS provider
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!!! info "Available time segments and platforms"
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- Available for all time segments
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- Available for Android and iOS
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!!! info "File Sequence"
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```bash
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- data/raw/{pid}/phone_screen_raw.csv
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- data/raw/{pid}/phone_screen_with_datetime.csv
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- data/interim/{pid}/phone_screen_episodes.csv
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- data/interim/{pid}/phone_screen_episodes_resampled.csv
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- data/interim/{pid}/phone_screen_episodes_resampled_with_datetime.csv
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- data/interim/{pid}/phone_screen_features/phone_screen_{language}_{provider_key}.csv
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- data/processed/features/{pid}/phone_screen.csv
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```
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Parameters description for `[PHONE_SCREEN][PROVIDERS][RAPIDS]`:
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|Key | Description |
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|----------------|-----------------------------------------------------------------------------------------------------------------------------------
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|`[COMPUTE]`| Set to `True` to extract `PHONE_SCREEN` features from the `RAPIDS` provider|
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|`[FEATURES]` | Features to be computed, see table below
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|`[REFERENCE_HOUR_FIRST_USE]` | The reference point from which `firstuseafter` is to be computed, default is midnight
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|`[IGNORE_EPISODES_SHORTER_THAN]` | Ignore episodes that are shorter than this threshold (minutes). Set to 0 to disable this filter.
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|`[IGNORE_EPISODES_LONGER_THAN]` | Ignore episodes that are longer than this threshold (minutes). Set to 0 to disable this filter.
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|`[EPISODE_TYPES]` | Currently we only support `unlock` episodes (from when the phone is unlocked until the screen is off)
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Features description for `[PHONE_SCREEN][PROVIDERS][RAPIDS]`:
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|Feature |Units |Description|
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|-------------------------- |---------- |---------------------------|
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|sumduration |minutes |Total duration of all unlock episodes.
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|maxduration |minutes |Longest duration of any unlock episode.
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|minduration |minutes |Shortest duration of any unlock episode.
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|avgduration |minutes |Average duration of all unlock episodes.
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|stdduration |minutes |Standard deviation duration of all unlock episodes.
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|countepisode |episodes |Number of all unlock episodes
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|firstuseafter |minutes |Minutes until the first unlock episode.
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<!-- |episodepersensedminutes |episodes/minute |The ratio between the total number of episodes in an epoch divided by the total time (minutes) the phone was sensing data. -->
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!!! note "Assumptions/Observations"
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1. In Android, `lock` events can happen right after an `off` event, after a few seconds of an `off` event, or never happen depending on the phone\'s settings, therefore, an `unlock` episode is defined as the time between an `unlock` and a `off` event. In iOS, `on` and `off` events do not exist, so an `unlock` episode is defined as the time between an `unlock` and a `lock` event.
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2. Events in iOS are recorded reliably albeit some duplicated `lock` events within milliseconds from each other, so we only keep consecutive unlock/lock pairs. In Android you cand find multiple consecutive `unlock` or `lock` events, so we only keep consecutive unlock/off pairs. In our experiments these cases are less than 10% of the screen events collected and this happens because `ACTION_SCREEN_OFF` and `ACTION_SCREEN_ON` are `sent when the device becomes non-interactive which may have nothing to do with the screen turning off`. In addition to unlock/off episodes, in Android it is possible to measure the time spent on the lock screen before an `unlock` event as well as the total screen time (i.e. `ON` to `OFF`) but these are not implemented at the moment.
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3. We transform iOS screen events to match Android's format, we replace `lock` episodes with `off` episodes (2 with 0) in iOS. However, as mentioned above this is still computing `unlock` to `lock` episodes.
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