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This is a U.S. Government computer system, which may be accessed and used only for authorized Government business by authorized personnel. Unauthorized access or use of this computer system may subject violators to criminal, civil, and/or administrative action. All information on this computer system may be intercepted, recorded, read, copied, and disclosed by and to authorized personnel for official purposes, including criminal investigations. Such information includes sensitive data encrypted to comply with confidentiality and privacy requirements. Access or use of this computer system by any person, whether authorized or unauthorized, constitutes consent to these terms. There is no right of privacy in this system.

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Global Positioning System (GPS) Measurement

30 Shared Subjects

Large-scale studies relating individual-level mobility patterns to a wide variety of patient-centered outcomes typically collect mobility traces continuously without significant gaps in the data, and consequently the problem of data missingness has been safely ignored. https://academic.oup.com/biostatistics/article/21/2/e98/5145908
Clinical Assessments
Task Based
12/07/2021
gps01
12/16/2021
View Change History
01
Definition
Submission Template
Query Element Name Data Type Size Required Description Value Range Notes Aliases
subjectkey GUID Required The NDAR Global Unique Identifier (GUID) for research subject NDAR*
src_subject_id String 20 Required Subject ID how it's defined in lab/project
interview_date Date Required Date on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYY
interview_age Integer Required Age in months at the time of the interview/test/sampling/imaging. 0::1440 Age is rounded to chronological month. If the research participant is 15-days-old at time of interview, the appropriate value would be 0 months. If the participant is 16-days-old, the value would be 1 month.
sex String 20 Required Sex of subject at birth M;F; O; NR M = Male; F = Female; O=Other; NR = Not reported
gps_day Integer Recommended Which day of the study is the participant on? Participant is studied over 60 days
gps_hometime Float Recommended Time spent at home 0::1440 Time is in minutes
gps_disttravelled Float Recommended Distance travelled Distance measured in meters
gps_rog Float Recommended Radius of gyration Radius measured in meters
gps_maxdiam Float Recommended Maximum diameter: the longest distance between any two points Diameter measusred in meters
gps_maxhomedist Float Recommended Maximum distance from home Distance measured in meters
gps_siglocsvis Float Recommended Number of significant locations visited that day Total number of locations in a day
gps_avgflightlen Float Recommended Average length of flight on that day Length measured in meters
gps_stdflightlen Float Recommended Standard deviation of the length of flights on that day Length measured in meters
gps_avgflightdur Float Recommended Average time flights took on that day Time measured in seconds
gps_stdflightdur Float Recommended Standard deviation of the time flights took on that day Time measured in seconds
gps_probpause Float Recommended Probability (fraction of time) a person is stationary (paused) during a day (as opposed to mobile/in flight) 0::1 Probability is percentage
gps_signlocentr Float Recommended Location entropy across a person's significant locations for the day
gps_minsmissing Float Recommended Number of minutes of missing data in a person's GPS mobility trace that day 1::1440 Total number of minutes in a day
gps_circdnrtn Float Recommended Circadian routine measuring similarity in a person's locations over the course of a day to that of the other days in the data set. 0::1 0= Completely different routine; 1= Identical routine
gps_wkenddayrtn Float Recommended Comparisons are stratified by grouping together weekends and grouping together weekdays into two separate groups. 0::1 Probability is percentage
Data Structure

This page displays the data structure defined for the measure identified in the title and structure short name. The table below displays a list of data elements in this structure (also called variables) and the following information:

  • Element Name: This is the standard element name
  • Data Type: Which type of data this element is, e.g. String, Float, File location.
  • Size: If applicable, the character limit of this element
  • Required: This column displays whether the element is Required for valid submissions, Recommended for valid submissions, Conditional on other elements, or Optional
  • Description: A basic description
  • Value Range: Which values can appear validly in this element (case sensitive for strings)
  • Notes: Expanded description or notes on coding of values
  • Aliases: A list of currently supported Aliases (alternate element names)
  • For valid elements with shared data, on the far left is a Filter button you can use to view a summary of shared data for that element and apply a query filter to your Cart based on selected value ranges

At the top of this page you can also:

  • Use the search bar to filter the elements displayed. This will not filter on the Size of Required columns
  • Download a copy of this definition in CSV format
  • Download a blank CSV submission template prepopulated with the correct structure header rows ready to fill with subject records and upload

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