本研究皆在比較四種Guttman型指標 (SCI、MCI、NCI和W&B) 的偵測結果，以提供教師運用指標的參考資訊。本研究以電腦隨機虛擬受試者作答反應，並對四個操控變項 (測驗長度、異常程度、異常類型及異常人數比) 的設定條件，置換作答反應成異常作答組型，然後比較各指標的相對偵測力並探討四個操控變項對指標偵測結果的影響；同時，以第80百分位數的指標決斷值修正原來文獻中以經驗法則判斷的指標決斷值來比較各指標的偵測結果。研究發現：(1) 採用未修正的決斷值，相對偵測力大小為W&B > SCI > MCI > NCI ，而採用修正的決斷值的相對偵測力大小則為W&B> NCI > SCI > MCI；(2) 採用修正的決斷值，各指標的偵測結果較採用未修正的決斷值的偵測結果更為一致；(3) 不論採用修正與否的決斷值， 各指標偵測率普遍受四個操控變項的影響。

The purpose of this study was to compare the effects of four Guttman-based indices (SCI, MCI, NCI, W & B). Aberant response data were randomly simulated and compared under four conditions (test length, severity of aberrance, types of misfit, and percentage of aberrant respondents). Also modified cutoffs (the 80th percentiles) were used to replace the cutoffs originally announced by their various thumb rules. Results showed that (1) significant differences of detection rates existed among four indices (W &B > SCI > MCI > NCI) under original thumb-rule cutoffs, but the rank changed (W &B > NCI > SCI > MCI) under the modified cutoffs. (2) detecting performanes of the four indices were more consistent in modified-cutoff situation than in thumb-rule situation. (3) either using modified or thumb-rule cutoff, almost indices were inferenced by the four simulated conditions.