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Psychol Assess. 2019 May 27. doi: 10.1037/pas0000730. [Epub ahead of print]

Normative comparison standards for measures of cognition in the Canadian Longitudinal Study on Aging (CLSA): Does applying sample weights make a difference?

Author information

1
Department of Psychology.
2
Institute on Aging & Lifelong Health, University of Victoria.
3
Department of Health Research Methods, Evidence, and Impact, McMaster University.
4
School of Psychology, Laval University.
5
School of Psychology, University of Ottawa.
6
Department of Statistics and Actuarial Science, University of Waterloo.
7
Department of Psychology and Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan.
8
Department of Epidemiology and Biostatistics and Occupational Health, McGill University.
9
Department of Community Health and Epidemiology, Dalhousie University.
10
Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster Institute for Research on Aging, and Labarge Centre for Mobility in Aging, McMaster University.

Abstract

Large-scale studies present the opportunity to create normative comparison standards relevant to populations. Sampling weights applied to the sample data facilitate extrapolation to the population of origin, but normative scores are often developed without the use of these sampling weights because the values derived from large samples are presumed to be precise estimates of the population parameter. The present article examines whether applying sample weights in the context of deriving normative comparison standards for measures of cognition would affect the distributions of regression-based normative data when using data from a large population-based study. To address these questions, we examined 3 cognitive measures from the Canadian Longitudinal Study on Aging tracking cohort (N = 14,110, Age 45-84 years at recruitment): Rey Auditory Verbal Learning Test - Immediate Recall, Animal Fluency, and the Mental Alternation Test. The use of sampling weights resulted in similar model parameter estimates to unweighted regression analyses and similar cumulative frequency distributions to the unweighted analyses. We randomly sampled progressively smaller subsets from the full database to test the hypothesis that sampling weights would help maintain the estimates from the full sample, but discovered that the weighted and unweighted estimates were similar and were less precise with smaller samples. These findings suggest that although use of sampling weights can help mitigate biases in data from sampling procedures, the application of weights to adjust for sampling biases do not appreciably impact the normative data, which lends support to the current practice in creation of normative data. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

PMID:
31135167
DOI:
10.1037/pas0000730

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