Abstract enThe purpose of this research was to equate the test for which were constructed in different conditions through scaling methods based on item response theory and to compare the results obtained from these methods. The research was conducted with using dichotomous simulated data which was consistent with two and three parameter logistic model. In order to equate two test forms “the commonitem nonequivalent groups” was used in this research. WINGEN3 program was utilized for data generation and 50 replication were done for 36 different condition used in this research. PARSCALE 4.1 was utilized for the prediction of item parameters and IRTEQ was utilized for test equating and scaling in separate calibration. The results obtained from this simulation study were evaluated based on equating error (RMSE) criterions. The results revealed that, when the conditions evaluated generally, the best equating occurred in 3000-subjects samples, 80-item tests, groups have similar ability distribution, using and mean-mean methods. Moreover, the results indicated that methods had less equating errors when large sample sizes together with long tests were used in groups which had similar ability distributions under the conditions considered in this research
abstract enthe purpose of this research was to equate the test for which were carried out in different conditions of thrughing methods based on items response theory and to face the results received from these methods the research was conducted with using dichotomus distributed data which was consistent with two and three parameters of the model of the order to equate two test forms “the commonitem nonequivalent groups” was used in this research wingen3 results were used for data generation and 50 comption was made in 36 conditions where different conditions were used in this file for the logic of data generation and price of the results in the file was determined by the result of the results of the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the reason for the results of the results of the reason for the reason for the reason for the reason for the results of the
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