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NDAR provides a single access to de-identified autism research data. For permission to download data, you will need an NDAR account with approved access to NDAR or a connected repository (AGRE, IAN, or the ATP). For NDAR 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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The filters you have selected from various query interfaces will be stored here, in the 'Filter Cart'. The database will be queried using filters added to your 'Filter Cart', when multiple filters are defined, each will be executed using 'AND' logic, so with each filter that is applied the result set gets smaller.

From the 'Filter Cart' you can inspect each of the filters that have been defined, and you also have the option to remove filters. The 'Filter Cart' itself will display the number of filters applied along with the number of subjects that are identified by the combination of those filters. For example a GUID filter with two subjects, followed by a GUID filter for just one of those subjects would return only data for the subject that is in both GUID filters.

If you have a question about the filter cart, or underlying filters please contact the help desk at The NDA Help Desk

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Data Structures with shared data
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Parent-Teacher Dyad Observation



Download Definition as
Download Submission Template as
Element NameData TypeSizeRequiredDescriptionValue RangeNotes
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired field
interview_ageIntegerRequiredAge in months at the time of the interview/test/sampling/imaging.0 :: 1260Age 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.
genderString20RequiredSex of the subjectM;FM = Male; F = Female
ptdyad_a1IntegerRecommendedParticipated actively in defining a target behavior.0;10=No; 1=Yes
ptdyad_a2IntegerRecommendedParticipated actively in defining a goal for the target behavior.0;10=No; 1=Yes
ptdyad_a3IntegerRecommendedDiscussed what is happening before or after the target behavior, as well as specific patterns that occur, during the focused time/setting.0;10=No; 1=Yes
ptdyad_a4IntegerRecommendedProvided evidence or verbal summaries about use of data collection.0;10=No; 1=Yes
ptdyad_a5IntegerRecommendedProvided evidence or verbal summaries about use of intervention procedures.0;10=No; 1=Yes
ptdyad_a6IntegerRecommendedAssisted in creating or improving upon data collection or intervention plans.0;10=No; 1=Yes
ptdyad_a7IntegerRecommendedDecided upon data collection or intervention plan.0;10=No; 1=Yes
ptdyadtot_aIntegerRecommendedA. Total Score on Primary Behavioral Engagement Components
ptdyad_b1IntegerRecommendedProvided relevant information regarding this student's strengths.0;10=No; 1=Yes
ptdyad_b2IntegerRecommendedProvided relevant information regarding this student's needs/challenges.0;10=No; 1=Yes
ptdyad_b3IntegerRecommendedShared relevant information about the school/family environment.0;10=No; 1=Yes
ptdyad_b4IntegerRecommendedProvided appropriate, relevant suggestions or feedback.0;10=No; 1=Yes
ptdyad_b5IntegerRecommendedSuggested appropriate expectations for this student.0;10=No; 1=Yes
ptdyad_b6IntegerRecommendedResponded to information shared by the parent/teacher.0;10=No; 1=Yes
ptdyadtot_bIntegerRecommendedB. Total Score on Secondary Behavioral Engagement Components
ptdyad_c1IntegerRecommendedCommunicated agreement/disagreement in a calm manner.0;10=No; 1=Yes
ptdyad_c2IntegerRecommendedAsked questions for clarification.0;10=No; 1=Yes
ptdyad_c3IntegerRecommendedCommunicated concerns with the parent/teacher in a clear and direct manner.0;10=No; 1=Yes
ptdyad_c4IntegerRecommendedUsed verbal or nonverbal indicators to convey understanding or facilitate the conversation (e.g., um-hm; gotcha; OK).0;10=No; 1=Yes
ptdyad_c5IntegerRecommendedMaintained involvement throughout the discussion without dominating the conversation.0;10=No; 1=Yes
ptdyad_c6IntegerRecommendedAcknowledged the concerns, perspectives or ideas of the parent/teacher.0;10=No; 1=Yes
ptdyad_c7IntegerRecommendedExpressed an understanding of the demands placed on the parent/teacher.0;10=No; 1=Yes
ptdyad_c8IntegerRecommendedShowed interest/engagement in the conversation.0;10=No; 1=Yes
ptdyad_c9IntegerRecommendedShared positive affect.0;10=No; 1=Yes
ptdyad_c10IntegerRecommendedProvided praise to the parent/teacher0;10=No; 1=Yes
ptdyadtot_cIntegerRecommendedC. Total Score on Psychological Engagement Components
ptdyadtotalIntegerRecommendedTotal Score on Dyad ObservationSUM(A,B,C)
version_formString100RecommendedForm used/assessment name
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.

Distribution for DataStructure: ptdyad01 and Element:
Chart Help

Filters enable researchers to view the data shared in NDA before applying for access or for selecting specific data for download or NDA Study assignment. For those with access to NDA shared data, you may select specific values to be included by selecting an individual bar chart item or by selecting a range of values (e.g. interview_age) using the "Add Range" button. Note that not all elements have appropriately distinct values like comments and subjectkey and are not available for filtering. Additionally, item level detail is not always provided by the research community as indicated by the number of null values given.

Filters for multiple data elements within a structure are supported. Selections across multiple data structures will be supported in a future version of NDA.