Critics maintain that researchers have consistently underestimated the potential for self-selection bias
in hospice cost savings estimates.
Such methods therefore aim to control for self-selection bias
by developing a control variable based upon a comparison of actual choices.
is particularly concerning when the selection effect influences the responses collected; thereby reducing the generalizability of the results of the study (relatedly see Chandler, Paolacci, Peer, Mueller, & Ratliff, 2015).
Just as important, because it does not focus solely on sexual assault, the problem of self-selection bias
is mitigated to some degree.
Ernie also sought to diminish self-selection bias
by having professors require students to attend tutoring.
The background characteristics and sexual behavior of participants who were circumcised during the posttrial period did not differ from those of men who remained uncircumcised, at either the last trial visit or the first posttrial visit, suggesting that self-selection bias
Data from each of the two educators and three class sections were examined for self-selection bias
. We found no significant differences attributed to course section or educator as measured by a one way analysis of variance (ANOVA) at the 0.05% level with respect to gender, mean cumulative GPA, math SAT, verbal SAT, or UVM Academic Composite Evaluation (ACE) (3) student admission scores.
The obvious drawback of this study is self-selection bias
. Each firm had applied for a State grant to reduce injuries; thus, these firms had already made a commitment to safety.
Participants answered an e-mailed invitation to take part in the survey, so there may be self-selection bias
. In addition, twice as many women as men responded to the survey, even though psoriasis affects men and women about equally, "so we weighted the data," he said.
Controlling for self-selection bias
in analysts' excessive coverage, we find that firms with high (low) analyst coverage consistently engage in higher (lower) external financing than do their industry peers of similar size.
(2004) found that what was previously identified in the literature as a price premium for the largest tier of auditors disappears when they control for auditee self-selection bias
. They base their results on a sample of privately held audit clients in the United Kingdom, thus while their technique is relevant, their results may not be generalizable to the US market for publicly-held firms.
Since participation in the survey was voluntary and the questionnaire was anonymous, there was no means of determining the extent of any self-selection bias
related to students' participation.