Correct identification and explanation of age-related changes are always possible

Peter C.M. Molenaar

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In this commentary, it is argued that the definition of the time or the age variable in the models presented by Hofer and Sliwinski is ambiguous, and a standard interpretation of this time of age variable is proposed instead. Some simulation studies are presented, the results of which indicate that, even with age-heterogeneous cross-sectional data, correct identification of the true sources of age-dependent variation is possible. An important qualification, based on new methodological work in progress, is given of the scope of longitudinal designs. It is concluded that all kinds of age-related changes are potentially interesting and can be correctly identified and explained.

Original languageEnglish (US)
Pages (from-to)13-17
Number of pages5
Issue number1
StatePublished - 2002

All Science Journal Classification (ASJC) codes

  • Aging
  • Geriatrics and Gerontology

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