title: Misuse of analysis of covariance in aging research and some partial solutions.
abstract: Gerontological researchers are reminded of the inappropriateness of analysis of covariance wherein the covariate is correlated with the independent variable, typically age. Two partial solutions are suggested that deal with the confounding of age effects with such uncontrolled variables as, for example, initial ability level or level of education.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging; D000704:Analysis of Variance; D004493:Education; D006801:Humans; D007360:Intelligence; D012107:Research Design