------------------------------------------------------------------ Observed Ordinal Step Measurement Model Type of Data: Categories/Interpretation/Score/for Loge[Pnij/Pnij-1] ------------------------------------------------------------------ BASIC no / less / 0 / Bn-Di -Rasch yes / more / 1 / j=1 COUNTS 0 / 0 / 0 / Bn-Di-Fi*loge[j] -Rasch infinity / inf / inf / j=1,inf TRIALS 0 / 0 / 0 / Bn-Di-Fi*loge[j/(mi-j+1)] -Choppin mi / mi / mi / j=1,mi RATINGS 1 / least / 0 / Bn-Di-Fj -Andrich 2 / . / 1 / . m+1 / most / m / j=1,m GRADES A / highest / mi / Bn-Di-Fij -Masters B / . / mi-1 / . partial credit Z / lowest / 0 / j=1,mi RANKS 1 / first / mi / Bn-Fj (complete) -Linacre 2 / . / mi-1 / Bn-Fij (partial) mi / . / 1 / . mi+1 / last / 0 / j=1,mi PAIRED COMPARISON 0 / less / 0 / Bn-Bi (forced choice) -Bradley/Terry 1 / tie / 1 / Bn-Bi-Fj (with ties) 2 / more / 2 / j=1,2 CREDITS 0 / 1st "item" wrong / 0 / Bn-Di-Fij -Glas 1 / 2nd "item" wrong / 10 / . success . / ... / 11.. / . mi-1 / mth "item" wrong / 11..10 / . mi / mth "item" right / 11..11 / j=1,mi DEBITS mi / mth "item" right / 1 / Bn-Di-Fij failure mi-1 / m-1th "item" right / 10 / . . / ... / ..00 / . 1 / 1st "item" right / 10..00 / . 0 / 1st "item" wrong / 00..00 / j=1,mi NEARNESS 0 / before / 0 / Bn-Di-Fj -Coombs 1 / here or now / 1 / . -Andrich 0 / after / 2 / j=1,2 ------------------------------------------------------------------
More complex models decompose into these models.
Rasch family of two-facet measurement models, B Wright Rasch Measurement Transactions, 1992, 6:2 p. 226
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