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Abstract
An evaluation of open education was shown to produce misleading results due to probable regression phenomena. This was a result of selective matching of unequal groups operating to bias results against open education. The degrees of freedom for matched data were also reported incorrectly. The questionable results are now spread wide in the literature of education, sociology, and psychology. Researchers are advised to review, not merely summarize, prior articles. Also, there were problems encountered in the computer literature searches in this area of open education.