selection bias

(redirected from Selection effect)

selection bias

[si′lek·shən ‚bī·əs]
(statistics)
A bias built into an experiment by the method used to select the subjects which are to undergo treatment.
Mentioned in ?
References in periodicals archive ?
These estimates were even smaller than the risk selection effect estimates in the choice group, which supports our assumption that our assumption that there is no risk selection based on unobserved enrollee characteristics in the no-choice group.
This finding supports the case that, on top of the selection effect, there is also a "wage policy effect.
Third, we explore the nature of the selection effect or the possibility that it is more productive men who marry.
This study included an endogeneity test of the insurance variable using a two-stage Hausman specification and found no evidence of a selection effect.
However, few studies have tried to account for a potential selection effect in insurance coverage for VA enrollees.
An empirical difficulty is that this moral hazard may be obscured by two factors--a selection effect may lead only high-quality workers to receive contracts and career concerns may provide additional incentives and dampen the post-contract decline.
We then estimated the selection effect by subtracting our model estimate of the HMO effect from the difference between our calculation of the total HMO and the total FFS inpatient days per thousand beneficiaries, attributing any remaining difference between HMO and FFS to selection.
The first part of model I of Table 2 suggests that a selection effect exists.
To identify a selection effect, this study focuses on OSA and Medicaid clients, who accounted for 46.
In other words, the provider selection effect is the change in expenditures that can be attributed to the inclusion or exclusion of different providers into the network.
The remaining difference, if any, is the selection effect.
Thus, there appears to be a likely selection effect on mental health benefit design, and the interpretation of those coefficients is less clear.