Phone Keyboard

Sensor parameters description for [PHONE_KEYBOARD]:

Key	Description
[CONTAINER]	Data stream container (database table, CSV file, etc.) where the keyboard data is stored. This can be a single container or an array of containers

RAPIDS provider

Available time segments and platforms

• Available for all time segments
• Available for Android only

File Sequence

- data/raw/{pid}/phone_keyboard_raw.csv
- data/raw/{pid}/phone_keyboard_with_datetime.csv
- data/interim/{pid}/phone_keyboard_features/phone_keyboard_{language}_{provider_key}.csv
- data/processed/features/{pid}/phone_keyboard.csv

Parameters description for [PHONE_KEYBOARD][PROVIDERS][RAPIDS]:

Key	Description
[COMPUTE]	Set to True to extract PHONE_KEYBOARD features from the RAPIDS provider
[FEATURES]	Features to be computed, see table below
[TYPING_SESSION_DURATION]	Minimum seconds to detect the end of a typing session. A session begins with any keypress and finishes until TYPING_SESSION_DURATION seconds (by default, 5 seconds) have elapsed since the last key was pressed or the application that the user was typing on changes.

Features description for [PHONE_KEYBOARD][PROVIDERS][RAPIDS]:

Feature	Units	Description
sessioncount	-	Number of typing sessions in a time segment. Type sesssions are detected based on TYPING_SESSION_DURATION parameter.
averagesessionlength	milliseconds	Average length of all sessions in a time segment instance
averageinterkeydelay	milliseconds	The average time between keystrokes measured in milliseconds.
changeintextlengthlessthanminusone		Number of times a keyboard typing or swiping event changed the length of the current text to less than one fewer character.
changeintextlengthequaltominusone		Number of times a keyboard typing or swiping event changed the length of the current text in exactly one fewer character.
changeintextlengthequaltoone		Number of times a keyboard typing or swiping event changed the length of the current text in exactly one more character.
changeintextlengthmorethanone		Number of times a keyboard typing or swiping event changed the length of the current text to more than one character.
maxtextlength		Length in characters of the longest sentence(s) contained in the typing text box of any app during the time segment.
lastmessagelength		Length of the last text in characters of the sentence(s) contained in the typing text box of any app during the time segment.
totalkeyboardtouches		Average number of typing events across all sessions in a time segment instance.

Note

1. We did not find a reliable way to distinguish between AutoCorrect or AutoComplete changes, since both can be applied with a single touch or swipe event and can decrease or increase the length of the text by an arbitrary number of characters.
2. The default value (5 seconds) of TYPING_SESSION_DURATION parameter is based on empirical tests with our datasets. It could be updated as needed. Vesel et al. (check this paper) used 8 seconds instead.