A reanalysis of the center for epidemiological studies depression scale (CES-D) using non-parametric item response theory
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We can obtain recently item response time data easily by Computer Testing. And we can evaluate examinees not only for test score but for response time. It is well known that IRT(Item Response Theory)is useful in item analysis for evaluation of test score. Similiarly we can apply item analysis for evaluation of examinee's response time to the idea of IRT. The authors proposed IRT for item response time. In this paper, the authors showed; 1. validity of the theory, 2. item analysis by the theory, 3. estimated examinee's ability for response time. And the authors showed the utilities of this theory by applying to practical data.
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In this paper, we introduce some monotonicity rules for the ratio of integrals. Furthermore, we demonstrate that the function -T ν,α,β (s) is completely monotonic in s and absolutely monotonic in ν if and only if β≥1, where T ν,α,β (s)=K ν 2 (s)-βK ν-α (s)K ν+α (s) defined on s>0 and K ν (s) is the modified Bessel function of the second kind of order ν. Finally, we determine the necessary and sufficient conditions for the functions s↦T μ,α,1 (s)/T ν,α,1 (s), s↦(T μ,α,1 (s)+T ν,α,1 (s))/(2T (μ+ν)/2,α,1 (s)), and s↦d n 1 dν n 1 T ν,α,1 (s)/d n 2 dν n 2 T ν,α,1 (s) to be monotonic in s∈(0,∞) by employing the monotonicity rules.
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Abstract In this work, a method to precisely define and quantify homogeneity of microstructures is proposed. Said method is based on an interpretation of the Gini index and it was developed specifically for microstructure homogeneity assessments. Object homogeneity and region homogeneity are examples of parameters developed to describe different aspects of homogeneity in micrographs. Using these parameters, the homogeneities of Al-Si casting alloys and cast iron have been evaluated. The method can be adapted and combined with other techniques to fit the requirements of a given study case. Further applications of the method are discussed.
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This paper describes diffractometric and interferometric installations for monitoring the optical homogeneity of materials in the mid- and far-IR regions. It gives the results of a calculation of the errors of optical homogeneity measurements by various methods. The results of measuring the optical homogeneity of large blanks made from optical crystals in the IR region are presented.
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