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Table 2 Estimates of discrimination and difficulty parameters of ITMAIS-m, under the GRM

From: Modification and verification of the Infant–Toddler Meaningful Auditory Integration Scale: a psychometric analysis combining item response theory with classical test theory

  Discrimination Difficulty
α(SE) β1(SE) β2(SE) β3(SE) β4(SE)
Item 3 5.062(0.169) − 0.818(0.027) − 0.256(0.024) 0.073(0.023) 0.390(0.024)
Item 4 4.587(0.148) − 0.262(0.024) 0.275(0.024) 0.746(0.026) 1.092(0.029)
Item 5 3.957(0.122) − 1.146(0.031) − 0.504(0.025) − 0.059(0.024) 0.295(0.025)
Item 6 3.998(0.121) − 0.915(0.029) − 0.073(0.024) 0.414(0.025) 0.728(0.026)
Item 7 4.944(0.163) − 0.188(0.024) 0.302(0.023) 0.670(0.025) 0.944(0.027)
Item 8 4.394(0.146) − 0.023(0.024) 0.332(0.023) 0.711(0.026) 1.074(0.030)
Item 9 5.431(0.221) − 0.229(0.024) − 0.106(0.023) 0.014(0.023) 0.098(0.023)
Item 10 3.947(0.137) 0.190(0.024) 0.628(0.026) 0.941(0.028) 1.150(0.031)
  1. ITMAIS-m modified Infant–Toddler Meaningful Integration Scale, GRM graded response model, SE standard error