NIMH Data Archive - Data Dictionary: Data Structure History

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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

Glossary

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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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