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Table 6 1PL covariance matrices (DIF adjustment)

From: An item response theory approach to longitudinal analysis with application to summer setback in preschool language/literacy

Model 1 T 1 T 2 T 3 T 4
T 1 1.00    
T 2 .71 1.66   
T 3 .47 .59 1.91  
T 4 .35 .46 1.30 1.66
Model 2 C 1 C 2 C 3 C 4
C 1 3.50    
C 2 .30 1.2   
C 3 -.35 .12 .56  
C 4 .44 .54 .02 .98