ERIC Number: EJ782683
Record Type: Journal
Publication Date: 2007-Dec
Reference Count: 0
Twins and the Study of Rater (Dis)agreement
Bartels, Meike; Boomsma, Dorret I.; Hudziak, James J.; van Beijsterveldt, Toos C. E. M.; van den Oord, Edwin J. C. G.
Psychological Methods, v12 n4 p451-466 Dec 2007
Genetically informative data can be used to address fundamental questions concerning the measurement of behavior in children. The authors illustrate this with longitudinal multiple-rater data on internalizing problems in twins. Valid information on the behavior of a child is obtained for behavior that multiple raters agree upon and for rater-specific perception of the child's behavior. Rater-disagreement variance [sigma][superscript 2](rd) accounted for 35% of the individual differences in internalizing behavior. Up to 17% of this [sigma][superscript 2](rd) was accounted for by rater-specific additive genetic variance [sigma][superscript 2](A[subscript u]). Thus, the disagreement should not be considered only to be bias/error but also as representing the unique feature of the relationships between that parent and the child. The longitudinal extension of this model helps to make a distinction between measurement error and the raters' unique perception of the child's behavior. For internalizing behavior, the results show large stability across time, which is accounted for by common additive genetic and common shared environmental factors. Rater-specific shared environmental factors show substantial influence on stability. This could mean that rater bias may be persistent and affect longitudinal studies.
Descriptors: Twins, Behavior Problems, Genetics, Error of Measurement, Longitudinal Studies, Parent Child Relationship, Child Behavior, Interrater Reliability, Individual Differences, Family Environment, Statistical Bias
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Publication Type: Journal Articles; Reports - Evaluative
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