解题策略的同质性和线性逻辑斯谛模型的拟合

为探讨线性逻辑斯谛模型（ＬＬＴＭ）的拟合条件及其和解题策略同质性之间的关系，让被试比较两个负整数指数幂的大小，发现全体被试的数据不能与拉希模型及ＬＬＴＭ相拟合。把被试按其解题策略分成不同策略组后，同一策略组被试的数据可以拟合于拉希模型，但对于ＬＬＴＭ，同一策略组的数据中部分项目的拟合较好，另外一些项目的拟合较差。这一结果表明，解题策略的同质性是ＬＬＴＭ拟合的必要条件，但还不是充分条件。

HOMOGENELTY OF PROBLEM SOLVING STRATEGIES AND THE FITTING OF LINEAR LOGISTIC TEST MODEL

The fitting condition of Linear Logistic Test Model(LLTM)and its relationship with homogeneity of problem solving strategies were discussed.In this research the subjects were asked to compare two negative whole number index powers.It was found that the data of all of the subjects could not fit Rasch model and LLTM.But after the subjects were divided into four strategy homogeneous groups, the data within each of these groups could fit Rasch model well.However,some items fit LLTM better,others did not fit LLTM so well within each group.This showed that the homogeneity of problem solving strategies was the necessary condition but not the sufficient condition for the fitting of LLTM.