Reply to Hamaker and Ryan: Within-sample temporal instability in cross-sectional estimates

Aaron J Fisher¹, Bertus F Jeronimus², John D Medaglia^{3

4}

Affiliations

¹ Department of Psychology, University of California, Berkeley, CA 94720; afisher@berkeley.edu.
² Department of Developmental Psychology, Faculty of Behavioural and Social Sciences, Interdisciplinary Center Psychopathology and Emotion Regulation, Groningen University, 9712 TS Groningen, The Netherlands.
³ Department of Psychology, Drexel University, Philadelphia, PA 19104.
⁴ Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104.

Comment

Aaron J Fisher et al. Proc Natl Acad Sci U S A. 2019.

. 2019 Apr 2;116(14):6546-6547.

doi: 10.1073/pnas.1820222116. Epub 2019 Mar 19.

Aaron J Fisher¹, Bertus F Jeronimus², John D Medaglia^{3

4}

¹ Department of Psychology, University of California, Berkeley, CA 94720; afisher@berkeley.edu.
² Department of Developmental Psychology, Faculty of Behavioural and Social Sciences, Interdisciplinary Center Psychopathology and Emotion Regulation, Groningen University, 9712 TS Groningen, The Netherlands.
³ Department of Psychology, Drexel University, Philadelphia, PA 19104.
⁴ Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104.

No abstract available

Conflict of interest statement

The authors declare no conflict of interest.

Lack of group-to-individual generalizability is a threat to human subjects research.
Fisher AJ, Medaglia JD, Jeronimus BF. Fisher AJ, et al. Proc Natl Acad Sci U S A. 2018 Jul 3;115(27):E6106-E6115. doi: 10.1073/pnas.1711978115. Epub 2018 Jun 18. Proc Natl Acad Sci U S A. 2018. PMID: 29915059 Free PMC article. Clinical Trial.
A squared standard error is not a measure of individual differences.
Hamaker EL, Ryan O. Hamaker EL, et al. Proc Natl Acad Sci U S A. 2019 Apr 2;116(14):6544-6545. doi: 10.1073/pnas.1818033116. Epub 2019 Mar 19. Proc Natl Acad Sci U S A. 2019. PMID: 30890640 Free PMC article. No abstract available.

1. Hamaker EL, Ryan O. A squared standard error is not a measure of individual differences. Proc Natl Acad Sci USA. 2019;116:6544–6545. - PMC - PubMed
1. Fisher AJ, Medaglia JD, Jeronimus BF. Lack of group-to-individual generalizability is a threat to human subjects research. Proc Natl Acad Sci USA. 2018;115:E6106–E6115. - PMC - PubMed
1. Adolf JK, Fried E. Ergodicity is sufficient but not necessary for group-to-individual generalizability. Proc Natl Acad Sci USA. 2019;116:6540–6541. - PMC - PubMed