Restriction of range occurs whenever design or circumstances abbreviate the values of one or both variables being correlated. Range restriction has an impact on score validity, score reliability, and statistical power. As a result, researchers need a more sophisticated concept of the relationship between.variance and correlation than the simple assumption that when variance goes down, correlati...

Janice Hansen & Lindsey E. Richland Department of Education University of California, Irvine Eric P. S. Baumer Information Science Cornell University William Tomlinson Information Technology University of California, Irvine ABSTRACT While much work has examined how students think and and learn with metaphors, relatively little research has focused on thinking about metaphors, that is, thinking ...

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Scientific Computation is emerging as absolutely central to the scientific method. Unfortunately, it is error-prone and currently immature: traditional scientific publication is incapable of finding and rooting out errors in scientific computation; this must be recognized as a crisis. Reproducible computational research, in which the full computational environment that produces a result is publ...