Hello, and welcome
to the Public-use Data Analysis System, or PDAS,
for the Substance Abuse and Mental Health Data Archive.
PDAS allows users to run cross-tab analyses,
perform logistic regressions,
and download the results of public use data analyses
to *.CSV format.
To get started with PDAS, open the SAMHDA website
and select "Analyze," "Public Data" from the toolbar...
...or select "Data," "Browse Studies,"
drill down to the appropriate study,
and click "Analyze Online."
The third way that a user can access PDAS
is by clicking the "Analyze Data Online" button
from the Quick Start menu on the Home page.
The PDAS application will open in a separate browser tab.
The PDAS home tab lists all of the surveys available for analysis.
Currently, only the National Survey on Drug Use and Health
(or NSDUH) surveys are available,
but in the near future other surveys will also be available.
From this tab,
you can select a survey for which to view data
and run analyses.
For example, I will click the NSDUH 2013 survey
and click the "Go" button
to open the survey and begin analyzing the data.
The "Survey Info" tab displays by default after selecting the survey.
All of the variables from the selected survey
display in the "Variables" pane on the left,
grouped together by categories.
Using this page,
you can review and organize the variables
in the Variable Browser on the right-hand pane.
For more information on using this page,
watch the "Reviewing Variables" in the Variable Browser video
located in this knowledge base.
To easily find a variable in the future,
you can add it as a Favorite,
similar to how you would do in a browser.
Click the "Add to Favorites" button
to star the variable and move it to the top of the list.
To remove it from the Favorites,
click the "Remove from Favorites" button.
Favorites appear the same on every tab
and can be added and removed on any tab.
Click the "Crosstab" tab to run crosstabs
using the variables from the selected survey.
...
A crosstab, or cross tabulation,
is a table that depicts the number of times
each of the possible variable combinations
occurred in the sample data.
The results display a table and graph.
For more information on using this page,
watch the "Running Crosstabs" video
located in this knowledge base.
Click the "Logistic Regression" tab
to run logistic regression using the variables from the selected survey.
...
Logistic regression uses a statistical model
to predict the value of a binary outcome variable
based on other variables in the data.
The results display as a table.
For more information on using this page,
watch the "Running Logistic Regressions" video
located in this knowledge base.
This concludes the "Getting Started" video for the PDAS application.
Refer to the PDAS knowledge base
by clicking the "Help" button in PDAS
for more information on using the application.
If you need more assistance,
please contact the SAMHDA Help Desk,
by clicking "Online Technical Assistance Form"
on the SAMHDA website.
Thank you for joining me today.