NDA Help Center

Login Dialog

Frequently Asked Questions


NDA Help Center

Filter Cart

The Filter Cart provides a way to query and access data for which you may be interested.  There are multiple places to go query and Add to Filter Cart (Sometimes called Download).  

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 add subjects, sometimes it may take a few minutes to populate.  You can continue to do other things 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 available for the subjects selected 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 available.  However, if you want to see all of the clinical and phenotype, then select, "Find All Subject Data" to see all the data avaialble for those subjects.  

when a secord or third filter is applied, an AND condition is used to determine the subjects that are exist in all filters.  If the subject does not appear in any filter, that subjects data will be excluded from your filter cart. Given the sparcity of data in the NDA, it is possible for no subjects to appear across filters.  If that happens, clear your filter cart, and start over.  

The NDA is looking to enhance query/filtering.  Until additional tools become available, it is best to package more data than you need and then package and download the data and use other tools to further restrict and analyze the data.  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

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.

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.

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:

Subscribe to our mailing list

Mailing List(s)
Email Format

You are now leaving the National Database for Autism Research (NDAR) web site to go to:

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


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

Accept Terms
Switch User

Request Access to Shared Data

Summary information on the data shared in NDA is available on the NDA homepage without the need for an NDA account. You can also build queries and view summary information on data without an account. To request access to detailed human subjects data, you must be sponsored by an NIH recognized institution with a Federalwide Assurance and have a research related need to access NDA data. NDA federated repositories have their own access requirements.

If you meet the above criteria, you can request access by completing a Data Use Certification, and signing it, or having it signed by the investigator if this is not you, and an institutional official with signature authority. If you do not know your institution's signing official, contact us at The NDA Help Desk. Additional research staff from the same institution may be added to the Data Use Certification by completing the Senior/Key Person Profile (Collaborating Investigator) section. There is no limit to the number of additional staff members who can be added to a data access request so only one request is needed for your entire lab.

To get started, create an NDA account or login to your existing one. Once approved, you'll have access to query and download all data available in the repository.

To request access, follow these steps:

  1. Create an account.

  2. Log in and go to your Data Permissions dashboard.

  3. Complete the access request instructions.


Once completed, the request is reviewed by the Data Access Committee (DAC) established to oversee access to the NDA shared data. Refer to SOP-04 Data Access Permission Request for the entire procedure.

Those approved will have access to NDA for one year after which you will need to reapply. Those publishing are required to acknowledge NDA as defined in the Data Use Certification. Additionally, the sharing of an NDA Study is strongly encouraged to provide proper attribution to those who initially collected the data.