Introduction to classical and modern test theory by Linda M. Crocker, , Holt, Rinehart, and Winston edition, in English. PDF | Test Theory is concerned with methods and criteria for the construction, evaluation Introduction to Classical and Modern Test Theory. Introduction to Classical and Modern Test Theory. Linda Crocker, James Algina echecs16.info ISBN:
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7 Classical Test Theory and the Measurement of Reliability . p and q, given observed scores p' and q' was to introduce two or more additional variables. Introduction to Classical and Modern Test Theory. Read more A Classical Introduction to Modern Number Theory (GTM) - 2nd Edition. Read more. Get this from a library! Introduction to classical and modern test theory. [Linda M Crocker; James Algina].
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Other studies were identified from the Spanish NHP38 "cession of use" registry, kept by one of the authors JA since Of the studies identified, data were available from 45, covering a total of 9, individuals. Selected variables from these 45 studies were collected in a common data base i. The classical index of discrimination was obtained by calculating the corrected item-total correlation coefficients r for each item with its hypothetical scale [ 3 ].
Endorsement indices were also determined for each item by calculating the proportion p of people choosing to answer 'Yes'. EFA deleted all cases with missing values listwise only cases with nonmissing values for all the items involved were used.
Cronbach's alpha coefficient [ 23 ] was calculated on the scales factors resulting from the EFA, to estimate the internal-consistency reliability of each new composite score. Following the basics assumptions of CTT [ 3 , 4 ], a summary score of the reduced questionnaire was obtained by summing and averaging the scores of their component dimensions. The reliability of the summary score was estimated using the formula proposed by Nunnally and Bernstein pp.
Additional EFA, based on principal component extraction, was used to determine whether the new dimensions could be reduced to a unique summary score. Each facet in the model B, D is a separate parameter.
Estimates of one of the sets of parameters are not affected by the other. This mathematical property enables "test-free" and "person-free" measurement. This property implies that the parameter that characterize an item does not depend on the ability distribution of the examinees and the parameter that characterize a subject does not depend on the set of test items. Item calibration defines the hierarchical order of severity "difficulty" of the items along the health continuum.
Item calibration is expressed in log-odd units logits , positioned along a hierarchical scale. A logit is defined as the natural log of an odds ratio. Logits of greater magnitude represent increasing item severity. One logit is the distance along the health continuum that increases the odds of observing the event specified in the measurement model by a factor of 2.
All logits are the same length with respect to this change in the odds of observing the indicative event. The unidimensionality of a scale can be evaluated by the pattern of item goodness-of-fit statistics and by a formal test of the assumption of local independence [ 5 , 9 , 10 ].
The original NHP38 was consecutively analyzed with the Rasch dichotomous response model. The Rasch analysis was performed with Version 2. To avoid negative values, and to express the resulting scores on a 0 best health status to worst health status scale score, the initial BIGSTEPS estimates were rescaled in all analysis, setting a new origin In order to determine the precision of each estimate, an associated standard error SE was calculated for each item and person in the sample.
The person separation index PSEP was also calculated. The PSEP is a ratio of standard deviation that describes the number of performance levels the test measures in a particular sample. Hence, the separation index has to exceed 2 or 3 in order to attain the desired level of reliability of at least 0.
A Person Strata of, "3" the minimum level to attain a reliability of 0. Chi-square fit statistics were used to determine how well each NHP38 item contributed to defining a common health variable Goodness-of-fit test [ 9 , 10 ]. Similar Items Related Subjects: Psychologische tests. Psychological tests User lists with this item 1 Things to Check Out 1 items by D1yana updated Linked Data More info about Linked Data.
Primary Entity http: CreativeWork , schema: MediaObject , schema: Introduction to measurement theory -- What is test theory? Reliability -- Reliability and the classical true score model -- Procedures for estimating reliability -- Introduction to generalizability theory -- Reliability coefficients for criterion-referenced tests -- UNIT 3: Test scoring and interpretation -- Correcting for guessing and other scoring methods -- Setting standards -- Norms and standard scores -- Equating scores from different tests.
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