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Multilevel models for repeated measures: A flexible approach for studying dental arch morphology
Author(s) -
Tanguay Richard,
Buschang Peter H.,
Goldstein Harvey
Publication year - 1993
Publication title -
american journal of human biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.559
H-Index - 81
eISSN - 1520-6300
pISSN - 1042-0533
DOI - 10.1002/ajhb.1310050112
Subject(s) - dental arch , arch , multilevel model , statistics , repeated measures design , mathematics , random effects model , econometrics , orthodontics , medicine , geography , meta analysis , archaeology
Traditional OLS and recently developed multilevel IGLS statistical techniques for analyzing repeated measures are compared and contrasted. Comparisons are based on arch width measurements for a mixed‐longitudinal sample of 166 boys and girls. The multilevel IGLS procedures produce estimates that are more stable and meaningful than OLS estimates; sex differences are consistent for both the deciduous and permanent dentitions, maxillary widths are related to chronological age, and standard errors are consistently smaller based on the IGLS procedures. The multilevel procedures are also able to estimate variances and covariances—even when all measurements are not available for each subject—which can be used for predicting arch length. © 1993 Wiley‐Liss, Inc.