Equating of standardized science subjects tests using various methods: which is the most profitable?

A good test set can be reflected in the quality of items. It measure ability takers reasonably even though they are distributed several question packages. This study uses an exploratory, descriptive method to determine equivalence standardized sets science subjects for junior high schools Indonesia. The data were obtained from database Junior High School National Examination results subject Natural Sciences, which consisted 5 packages with 40 items/package. equating technique Item Response Theory 3 PL approach help R Studio Software. research show that national exam questions, consist packages, have a level item difficulty and all guesses. However, discrimination index items unfavorable results. In addition graphical using closeness characteristic curve, Stocking & Lord methods produce most equivalent scores. These findings reference developers or researchers field measurement better more accurate kits.