Page 165 - BUKU SYNOPSIS

means they function well and are well understood by all raters so they can

measure students' writing skills. In addition, several indicators to evaluate

the item fit is the values of the saparation, strata, and reliability; 3.43, 4.91,

and 0.92.

The classification of the Point Measure Correlation value into

different categories, namely very good (>0.40), good (0.30–0.39), adequate

(0.20-0.29), unable to discriminate (0.00-0.19), and requires examination of

the item (<0.00), was proposed by Alagumalai and Curtis (2005). This

classification is based on the understanding that point-measure correlation

is equivalent to point-biserial correlation in classical test theory. The

preliminary analysis findings reveal that each item within the rubric for

assessing writing skills has a point measure correlation value over 0.40. This

suggests that all items meet the criterion of being classified as "very good."

All values indicate that each item of the analytical scoring rubric for

argumentative text is fit with the model. The probability curve shown in

Figure 17 can also prove item fit analysis.

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