Nan Kong

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Questions related from Nan Kong

Why Total Score has the relationship between Overall Score and Sub-scores while IRT-Ability Score Has Not?

Total Score is defined with the number of those correctly-responded (dichotomous) items; Sub-score is defined as the total score associated with the sub-scale; Overall Score is defined as the...

07 July 2019 4,915 2 View

How to measure the shared ability and unique ability across two groups of examinees?

Because General Total Score has its additive structure (or more generally, decomposition theory), it is possible to measure the similarity (shared ability) and difference (unique ability) across...

07 July 2018 2,437 0 View

Items Decomposition: How to structure the Scores and Items (I) ?

Abstract: Without loss of generality, the decompositions for two and three items are mathematically defined and then, graphic representation is introduced to assist in understanding the...

04 April 2018 9,509 0 View

How to calculate the overall score based on partially-credited item responses?

Based on published item response data LSAT and pcmdat2, the General Total Score and Total Score are applied for numerical (high-stake) scoring. Item Response Theory (IRT) 2PL model is also applied...

03 March 2018 1,285 0 View

No evidence to suggest that psychological methods measured anything, as the additivity of psychological attributes had not been demonstrated?

"The first official detailed investigation of the validity of psychological measurement from beyond its professional ranks was conducted – under the auspices of the British Association for the...

06 June 2017 3,124 3 View

The total score is the major tool for student's reorted score. How to score those items that have different difficulty levels and partial credits etc?

The total score, which is the number of the correctly responded items (questions),is the major tool for student's reported score (high stake scoring). How to create the high stake scores for each...

04 April 2017 6,155 6 View

Which one should we trust --Item Response Theory (IRT) or Total Score?

In practice, IRT (2PL/3PL) and Total Score may not be consistent. In case that, for two examinees, say S1 and S2, there are IRT ability (S1) > IRT ability (S2) Total...

01 January 1970 1,262 17 View