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Table 5 Growth parameter estimates

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

    T Contrast C Contrast
DIF Model Effect Estimate SE Estimate SE
No DIF Adjustment 1PL 2 1.09 .03 -.48 .04
  3 .41 .04 .38 .08
   4 2.26 .03 1.60 .04
  2PL 2 1.02 .03 -.39 .04
   3 .47 .04 .37 .08
   4 2.22 .04 1.57 .06
DIF Adjusted 1PL 2 1.16 .04 -.50 .06
  3 .45 .04 .50 .08
   4 2.60 .06 1.84 .08
  2PL 2 .58 .04 -.33 .06
   3 .12 .03 .37 .06
   4 1.43 .07 1.01 .10
  1. Note. All coefficients are significant at α = .001.