This article requires a subscription to view the full text. If you have a subscription you may use the login form below to view the article. Access to this article can also be purchased.
Ecological studies involve groups of people, rather than individuals, as the units of study. Since group data are easier to obtain (eg, census or other national survey information), these studies are often used to generate hypotheses for further study. The 2 studies of MMR vaccine and autism reviewed in this issue are ecological studies that examined whether changes in immunization rates correlated with …
Individual Login
Institutional Login
You may be able to gain access using your login credentials for your institution. Contact your librarian or administrator if you do not have a username and password.
Log in through your institution
Purchase access
In this issue
Jump to section
Related Articles
Cited By...
- No citing articles found.