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This Study Investigated the psychometric characteristics of vocabulary intelligence test according to latent trait theory, by administering the test to randomly selected 246 students between 5-9 years old distributed over Kg2 and 1st , 2nd and 3rd Primary grade from the government schools in Irbid city. The Dichotomous model was used to analyze data. The final form of the test consisted of 16 items fit the model with mean square infit/outfit statistics about 1, and standardized information weighted fit statistics about zero. Item difficulty parameters ranged from -2.16 to 2.13 logit with a mean of zero logit. The values of person reliability and item reliability were 0.81, 0.92 respectively. The test has multiple validity indicators.



Dichotomous model latent trait theory item parameter intelligence test.

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