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Modeled Variance in Two-Level Models

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SNIJDERS, TOM A. B., BOSKER, ROEL J.·1994·Sociological Methods & Research

Abstract

The concept of explained proportion of variance or modeled proportion of variance is reviewed in the situation of the random effects hierarchical two-level model. It is argued that the proportional reduction in (estimated) variance components is not an attractive parameter to represent the joint importance of the explanatory (independent) variables for modeling the dependent variable. It is preferable instead to work with the proportional reduction in mean squared prediction error for predicting individual values (for the modeled variance at level 1) and the proportional reduction in mean squared prediction error for predicting group averages (for the modeled variance at level 2). It is shown that when predictors are added, the proportion of modeled variance defined in this way cannot go down in the population if the model is correctly specified, but can go down in a sample; the latter situation then points to the possibility of misspecification. This provides a diagnostic means for identifying misspecification.

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Metadata

Authors
SNIJDERS, T. A. B., & BOSKER, R. J.
Venue
Sociological Methods & Research
Published
1994-02
Volume
22
Issue
3
Pages
342-363
ISSN
  • 0049-1241 (ISSN-L)
  • 1552-8294
OpenAlex
W2143170158
Cited by
724
References
0
FWCI
4.57
Type
journal article
Language
en
Open access
green

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