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Rostami E. Psychometric properties of school readiness test of first Step according to Item Response Theory. JNIP 2021; 7 (11) :1-9
URL: http://jnip.ir/article-1-472-en.html

The present study was conducted to evaluate the psychometric properties of school readiness test ofFIRST STEP in Guilan province, according to Item Response Theory. For this purpose, a sample of 1500 subjects was selected randomly from all the students who participated in the program of physical health and school readiness in Guilan province in 2012-2013 , and the data obtained from the implementation of the test on this sample group, collected and used for statistical analysis according to Item Response Theory . Initially , Unidimensionality and Local Independence were investigated using the NOHARM program , which showed that the test was Unidimensionality and consequently , its Local Independence . Then , to estimate the best model - data for this test , according to Item Response Theory and using the statistical analysis program BILOG . MG , the necessary analysis was done on the data . Finally , the results indicated that the two - parametermodelhad a better fit with the test . In the next step , the parameters of the questionnaire in the two - parameter model ( Item Difficulty and the Discriminating Power ) as well as the ability parameters of the subjects were extracted and it was determined that the average difficulty of the questions was - 2.93 , indicating easy questions . The Item Information Functiontest diagram also indicated that the most awareness of this test was -3 in abilities , and this means that most of the questions in this test are suitable for people with low abilities . In analyzing the Differential Item Functioning based on different groups of gender , residence , having a nursery history and the age of the novices , the analyzes were done using the BILOG . MG statistical analysis program , shows that this test has a bias towards these groupings and these factors have a significant impact on the respondent's responses to the test questions .