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...

11 July 2019 3,759 2 View

How the overall score is related to their subscale scores?

This is the third section of Items Decomposition: How to structure the Scores and Items. This section describes, using the graphical representation, how the score associated with all items in a...

08 June 2018 9,078 4 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 2,920 17 View

Item Response Theory (IRT) does not measure test-takers' ability (2)?

The theta parameter (latent variable) in Item Response Theory (IRT) is not a measure for test-takers' ability although it may be positively correlated to the test-takers' ability. Lets start with...

01 January 1970 9,952 7 View

Item Response Theory (IRT) does not measure test-takers' ability (1)?

The theta parameter (latent variable) in Item Response Theory (IRT) is not a measure for tester-takers' ability although it may be positively correlated to the test-takers' ability? The comment...

01 January 1970 5,227 2 View

Why Psychophysical Methods Measure Nothing without Additivity?

"When in 1940, a committee established by the British Association for the Advancement of Science to consider and report upon the possibility of quantitative estimates of sensory events published...

01 January 1970 9,984 4 View