Regression toward the mean

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Regression toward the mean

The tendency that a random variable will ultimately have a value closer to its mean value.
References in periodicals archive ?
With quasi-experimental pre-post designs, regression to the mean can still limit study findings, particularly when baseline group differences exist.
Again, tests were conducted on whether the improvement could be explained by the regression to the mean.
5] Nonstandard abbreviations: IGF-I, insulinlike growth factor I; IGFBP-3, IGF binding protein 3; ALS, acid labile subunit; PINP, N-terminal propeptide of type I procollagen; ICTP, C-terminal telopeptide of type I collagen; PIIINP, N-terminal propeptide of type III procollagen; GH, growth hormone; RTM, regression to the mean.
Instrumental variables estimates, intended to correct for measurement error, show less regression to the mean than the OLS estimates.
Finally, despite the disadvantages of potential biases introduced by regression to the mean and the stigma confound, a significant advantage available to researchers of a failing school voucher program is the ready availability of an exogenous policy shift that creates a sample of threatened and unthreatened schools.
The lower effect size was expected because the RD design is robust to regression to the mean (a likely source of inflated impact in the pretest-posttest design given that only children with very high SAB use were enrolled in the intervention).
SafetyAnalyst will use an Empirical Bayes (EB) approach that combines observed and expected crash frequencies to provide estimates of the safety performance of specific sites that are not biased by regression to the mean.
Ignorance of regression to the mean explains why clubs can fail to get value for money for a manager, or players.
Regarding the increase in insurer trust, this appears to be partially due to a regression to the mean, but since the drifts from the two extremes do not cancel each other out, this suggests that the initial extremes are greater on the low end than the high end.
Frankel may well get plenty of good runners, and I hope he does, but I can guarantee he will never sire his equal; he is the ceiling, and regression to the mean dictates that all his stock will be inferior to him.
The results suggest that regression to the mean is not a major problem that would adversely affect our 2002 results as much as it might affect our 2001 results.
However, Humana's analysis has seen some evidence of much lower regression to the mean in the healthiest quintile of members.