NDA Help Center

Login Dialog

Frequently Asked Questions


NDA Help Center

Filter Cart

The Filter Cart provides a powerful way to query and access data for which you may be interested.  

A few points related to the filter cart are important to understand with the NDA Query/Filter implementation: 

First, the filter cart is populated asyncronously.  So, when you run a query, it may take a moment to populate but this will happen in the background so you can define other queries during this time.  

When you are adding your first filter, all data associated with your query will be added to the filter cart (whether it be a collection, a concept, a study, a data structure/elment or subjects). Not all data structures or collections will necessarily be displayed.  For example, if you select the NDA imaging structure image03, and further restrict that query to scan_type fMRI, only fMRI images will appear and only the image03 structure will be shown.  To see other data structures, select "Find All Subject Data" which will query all data for those subjects. When a secord or third filter is applied, an AND condition is used.  A subject must exist in all filters.  If the subject does not appear in any one filter, that subjects data will not be included in your filter cart. If that happens, clear your filter cart, and start over.  

It is best to package more data than you need and access those data using other tools, independent of the NDA (e.g. miNDAR snapshot), to limit the data selected.  If you have any questions on data access, are interested in using avaialble web services, or need help accessing data, please contact us for assistance.  

Frequently Asked Questions



Reset Password

NDA provides a single access to de-identified autism research data. For permission to download data, you will need an NDA account with approved access to NDA or a connected repository (AGRE, IAN, or the ATP). For NDA access, you need to be a research investigator sponsored by an NIH recognized institution with federal wide assurance. See Request Access for more information.

Warning Notice

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.

Update Password

You have logged in with a temporary password. Please update your password. Passwords must contain 8 or more characters and must contain at least 3 of the following types of characters:

  • Uppercase
  • Lowercase
  • Numbers
  • Special Characters limited to: %,_,!,@,#,$,-,%,&,+,=,),(,*,^,:,;

Subscribe to our mailing list

Mailing List(s)
Email Format

You are now leaving the NIMH Data Archive (NDA) web site to go to:

Click on the address above if the page does not change within 10 seconds.


NDA is not responsible for the content of this external site and does not monitor other web sites for accuracy.

Accept Terms
Filter Cart
No filters selected
Value Range
Data Structures with shared data
No filters have been selected
Switch User

Ecological Momentary Assessment Data

158 Shared Subjects

Clinical Assessments
Task Based
View Change History
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 Required field
interview_age Integer Required Age in months at the time of the interview/test/sampling/imaging. 0 :: 1260 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 the subject M;F M = Male; F = Female gender
Query timept Integer Recommended Time Point 888 = not applicable; 999 = missing timestamp
proceduretrial String 20 Recommended trial type datatype
Query hour Integer Recommended Hour of the day of the sample 0 :: 24 Range begins at 0 = Midnight
Query x_acl Float Recommended Change in acceleration in the X axis in m/s^2 x
Query y_acl Float Recommended Change in acceleration in the Y axis in m/s^2 y
Query z_acl Float Recommended Change in acceleration in the Z axis in m/s^2 z
Query aclavg Float Recommended Root mean square acceleration across al three axes in m/s^2 using: sqrt(X^2+Y^2+Z^2)
gpsevent String 20 Recommended Description of reason for GPS sample Activating = Phone turned on location services; App-Pausing = App switched to background; App-Resuming = App switched to foreground; Deactivating = Phone turned off location services; Disabling-Services = Location services turned off; Disabling-Timer = Location services turned off from timer; Enabling-Services = Location services turned on from timer; gps-Disabled = Location services turned off; Location-Changed = GPS coordinates changed since last recording; network-Disabled = Network location services turned off; Status-Changed = Satellite connection lost event
enabled String 5 Recommended Location tracking turned on TRUE = Location services on; FALSE = Location services off
gpsevent_type String 20 Recommended Type of location services available network-and-gps = Network and GPS sattelites; network-only = Network; no-location-services = No location services event_type
gpssource String 7 Recommended Source of GPS location gps = GPS system; network = cellular or wifi signal source
Query gpsaccuracy Float Recommended Accuracy of GPS coordinates in meters accuracy
Query gpslatitude Integer Recommended GPS location in degrees latitude
Query gpslongitude Integer Recommended GPS location in degrees longitude
Query seconds_on Integer Recommended For periodic tracking, current ON duration
Query seconds_off Integer Recommended For periodic tracking, current OFF duration
Query time_interval Integer Recommended Seconds, minimum time interval between updates
Query distance Float Recommended Meters, minimum distance between updates
Query geofence_count Integer Recommended Number of active geofences
Query recorded Integer Recommended time of recording HH:MM
Query satellite_count Integer Recommended Number of satelites used in recording
Query distance_change Float Recommended Change in distance in meters from previous recording
Query gpshome Integer Recommended If GPS sample is within half a km of participant home 0;1 0 = Not at home; 1 = Home home
Query latitude_masked Float Recommended GPS location in degrees, masked with participant home equal to 0
Query longitude_masked Float Recommended GPS location in degrees, masked with participant home equal to 0
Query meters_from_home Float Recommended Meters from home GPS location
Query smp_cnt Float Recommended Number of audio samples recorded at 16KHZ
Query max_amp Float Recommended Maximum amplitude of audio during sample period
Query min_amp Float Recommended Minimum amplitude of audio during sample period
Query max_amp_abs Float Recommended Maximum amplitude of audio during sample period using absolute value
Query min_amp_abs Float Recommended Minimum amplitude of audio during sample period using absolute value
Query mean_amp Float Recommended Mean of audio during sample period
Query mean_amp_abs Float Recommended Mean of audio during sample period using absolute value
Query median_amp Float Recommended Median amplitude
Query rms Float Recommended Root mean sum of amplitude
Query vari Float Recommended Variance of amplitude in sample
Query sqr_vari Float Recommended Root square of variance std_dev
Query vox_act Float Recommended Number of frames in audio sample in which voice activity is detected
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

Please email the The NDA Help Desk with any questions.