Home > Publications . Search All . Browse All . Country . Browse PSC Pubs . PSC Report Series

PSC In The News

RSS Feed icon

Lam looks at population and development in next 15 years in UN commission keynote address

Mitchell et al. find harsh family environments may magnify disadvantage via impact on 'genetic architecture'

Frey says Arizona's political paradoxes explained in part by demography

Highlights

4/17/14: NIH announces new policy for resubmissions

2014 PAA Annual Meeting, May 1-3, Boston

PSC newsletter spring 2014 issue now available

Raghunathan appointed director of Survey Research Center

Next Brown Bag


PSC Brown Bags will return in the fall

Addressing selection bias in dental health services research

Publication Abstract

Lee, J.Y., R.G. Rozier, Edward Norton, and W.F. Vann. 2005. "Addressing selection bias in dental health services research." Journal of Dental Research, 84(10): 942-946.

When randomization is not possible, researchers must control for non-random assignment to experimental groups. One technique for statistical adjustment for non-random assignment is through the use of a two-stage analytical technique. The purpose of this study was to demonstrate the use of this technique to control for selection bias in examining the effects of the The Supplemental Program for Women, Infants, and Children's (WIC) on dental visits. From 5 data sources, an analysis file was constructed for 49,512 children ages 1-5 years. The two-stage technique was used to control for selection bias in WIC participation, the potentially endogenous variable. Specification tests showed that WIC participation was not random and that selection bias was present. The effects of the WIC on dental use differed by 36% after adjustment for selection bias by means of the two-stage technique. This technique can be used to control for potential selection bias in dental research when randomization is not possible.

Country of focus: United States.

Browse | Search : All Pubs | Next