What are the differences between PDAS, RDAS, and the Data Portal?

PDAS
The Public-use Data Analysis System (PDAS) is an online analysis tool for users to analyze public-use data files (PUFs). This tool allows users to review study variables, run crosstab analyses, perform logistic regressions, and download the results of any analysis to CSV format.

RDAS
The Restricted-use Data Analysis System (RDAS) is an online tool that lets users output custom crosstabs using restricted-use NSDUH files (RUFs) that pass built-in confidentiality restraints. RDAS will be available to anyone who is willing to create a simple user account. It is similar to the publicly-accessible PDAS tool, except it is populated with restricted data, including certain geographic identifiers not available in the NSDUH PUFs.

The RDAS has most of the variables available on the full RUF, including state identifiers. All RDAS estimates use a minimum of two years of pooled data; single-year estimates are not available using RDAS. Only the NSDUH data will be available in the initial release of RDAS.

Data Portal
The Data Portal will offer confidential datasets that require SAMHSA approval for access to protect identifiable data from disclosure. The Data Portal grants access to the full restricted use file (RUF) for each year for the available datasets, including NSDUH, DAWN, medical examiner files, and clinical adult interviews.