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. Author manuscript; available in PMC: 2010 Mar 24.
Published in final edited form as: Psychol Assess. 2008 Sep;20(3):206–216. doi: 10.1037/a0012764

Table 3. Model Comparison of Effect of Age, Study, and Age × Study Interaction on Liability to DSM–IV Generalized Anxiety Disorder (Including Stems).

Model number Model −2LnL df Δχ2 Δdf AIC
1 Full measurement invariance (baseline) 14,247.28 14,408 −14,568.72
Effects on latent mean
2 Age (vs. Model 1) 14,246.62 14,407 0.65 1 −14,567.38
3 Study (vs. Model 1) 14,244.44 14,407 2.84 1 −14,569.56
4 Age and study (vs. Model 1) 14,243.31 14,406 3.96 2 −14,568.68
5 Age, Study, and Age × Study interaction (vs. Model 1) 14,224.12 14,405 23.15*** 3 −14,585.88
Effects on thresholds
6 Age (vs. Model 2) 14,207.82 14,402 38.80*** 5 −14,596.18
7 Study (vs. Model 3) 14,178.99 14,402 65.45*** 5 −14,625.01
8 Age and study (vs. Model 4) 14,156.31 14,396 87.00*** 10 14,635.69
9 Age, Study, and Age × Study interaction (vs. Model 5) 14,146.46 14,390 77.67*** 15 −14,633.54
Effects on latent variance
10 Age (vs. Model 1) 14,246.04 14,407 1.24 1 −14,567.96
11 Study (vs. Model 1) 14,241.95 14,407 5.32* 1 −14,572.04
12 Age and study (vs. Model 1) 14,241.73 14,406 5.55 2 −14,570.27
13 Age, Study, and Age × Study interaction (vs. Model 1) 14,237.74 14,405 9.53* 3 −14,572.26
Effects on factor loadings
14 Age (vs. Model 10) 14,219.07 14,402 26.95*** 5 −14,584.93
15 Study (vs. Model 11) 14,196.12 14,402 45.74*** 5 −14,607.88
16 Age and study (vs. Model 12) 14,179.55 14,396 62.18*** 10 −14,612.45
17 Age, Study, and Age × Study interaction (vs. Model 13) 14,171.84 14,390 65.90*** 15 −14,608.16

Note. N = 6,426. The most parsimonious models are shown in boldface. DSM–IV = Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition; AIC = Akaike information criterion.

*

p < .05.

***

p < .001.