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0.008 Post Smooth 0.2 Post Smooth 50 Raw Score absolute kurtosis difference ACT Assessment American College Testing Average Absolute Bias Bias S.E. RMSE Colton computed Curve Equating Method Curve Post Smooth different test forms error of equating F before equating functions for ACT G after equating Hanson Kolen large sample sizes Licensure test linear method mean squared error methods for ACT model fit Moments in Equipercentile observed data population distributions population equating relationship Post Smooth 0.2 post-smoothing method pre-smoothing quadratic curve equating quadratic curve method quadratic equating quadratic function quadratic method performed Raw Score 30 Raw Score Figure real test data Root mean squared S.E. RMSE s.e.(RMSE sample distributions Sample Size 2000 sampling error score point scores using observed Smooth 0.2 Post Smooth 0.5 Linear smoothed score distributions smoothing methods standard error test score third type Three Moments type populations Table Unsmoothcd unsmoothed equipercentile equating unsmoothed equipercentile method weighted average Zeng