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Frequently Asked Questions


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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



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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.

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Gradual Onset Continuous Performance

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Clinical Assessments
Task Based
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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, sex
ncaid Integer Recommended Primary ID of Neurocognitive Test
site String 101 Recommended Site Study Site siteid
timept Integer Recommended Time Point 888 = not applicable; 999 = missing timepoint
visit String 50 Recommended Visit name gradcpt_timepoint
mpdat Float Recommended days from enrollment studyday
version_form String 100 Recommended Form used/assessment name gradcpt_version
testreason String 255 Recommended Reason for Testing gradcpt_type
trial Integer Recommended Trial number 0::400; -777; -999 1 = first; 2= second; 3=third; 4=fourth; 5=fifth; 6=sixth; etc; -777=NA, -999=missing gradcpt_trial
gradcpt_stim String 100 Recommended Image the Particpant Was Shown
gradcpt_correct Integer Recommended Go Trials(1) vs. No-Go Trials(0) -1 :: 2 -1=NA; 0=No-Go Trial; 1=Go Trial; 2=Scrambled Image (no response required); -1=NA
rt Float Recommended Reaction Time gradcpt_rt
gradcpt_accuracy Float Recommended Accuracy of Participant Response -2 :: 1 -2=NA;-1=Incorrect Response; 0=Incorrectly Withheld Response; 1=Correct Response; -2=NA; -1=Incorrect Response
gradcpt_responseassign Integer Recommended Which Image Participant Responding To -1 :: 2 -1=NA; 0=Response Withheld; 1=Transitioning Out; 2=Transitioning In
gradcpt_percentageimagen Float Recommended Percent of Target Image Visible When Responds
gradcpt_triallength Integer Recommended Time Image Is Displayed (ms)
gradcpt_rtcall Integer Recommended Internal TMB Variable Used To Track Errors #NAME?
battery_id Integer Recommended Identifier of Battery gradcpt_batteryid
testid Integer Recommended Identifier of Current Test gradcpt_testid
session_id String 20 Recommended session ID/screening ID gradcpt_sittingid
cbgroup Integer Recommended Counterbalancing Group gradcpt_group
aurora_device Integer Recommended Device Used 1 :: 6 1=iPad; 2=iPhone; 3=Tablet; 4=Android Smartphone; 5=Desktop; 6=Laptop gradcpt_device
correctrt_total_mean Float Recommended Mean reaction time for all correct trials gradcpt_meanrtc
gradcpt_medianrtc Float Recommended Median Reaction Time For All Correct Trials (ms)
correctrt_total_sd Float Recommended Standard deviation of the reaction time for all correct trials gradcpt_sdrtc
gradcpt_commission_errors Float Recommended % No-Go Trials Where Participant Incorrectly Responded
gradcpt_omission_errors Float Recommended % Go Trials Where Participant Incorrectly Withheld A Response
deviceserialnumber String 200 Recommended device serial number/ID gradcpt_useragent
testduration Integer Recommended Seconds Taken To Complete Test gradcpt_duration
testrestarts Integer Recommended Number Of Times Participant Restarted Test gradcpt_reloaded
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.