regression to the mean


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regression to the mean

The likelihood that over time probable events will occur and a normal distribution of events rather than that rare, unlikely, or unusual events will unfold.
References in periodicals archive ?
The identification of a similar comparison group limits the threats of history, maturation, and regression to the mean that are common to observational studies lacking such a comparison.
The second internal validity concern is regression to the mean.
Home Run Derby Curse versus Estimated Regression to the Mean Derby Estimated Regression Curse to the Mean Change in OPS -.
This finding suggests that the observed improvement on the competencies selected for development was significantly greater than explained by regression to the mean.
The phenomenon of regression to the mean was observed in this study, in which individuals with extreme measured values at the first measurement on average tended to regress toward the mean in subsequent measurements, such that lower/higher measured values at measurement 1 tend to be higher/lower, respectively, at subsequent measurements in the absence of any biological effect.
Regression to the mean occurs whenever scores are not perfectly correlated.
In addition, 2 studies provided further protection against regression to the mean by using a crossover design (27,30).
Asthma Disease Management: Regression to the Mean or Better?
Monitoring osteoporosis therapy with bone densitometry: misleading changes and regression to the mean.
In reading, however, we found no difference in the test-score gains achieved by F schools and low-performing non-F schools, suggesting that regression to the mean could be influencing our results in reading.
The long period of lowered admission rates throughout the program may be due to the increasing influence of the intervention or an effect of regression to the mean.