Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Set of three queries populating the 2-by-2 table
| Query 1 | find number of records where Attribute 1 contains value "present" |
| Query 2 | find number of records where Attribute 2 contains value "present" |
| Query 3 | find number of records where Attribute 1 contains value "present" AND Attribute 2 contains value "present" |
