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Application of Intraclass Correlation Coefficient to Reliability Assessment

Pan Xiaoping *, Ni Zongzan. Department of Health Statistics, School of Public Health,WCUMS, Chengdu 610041  
To evaluate the reliability of questionnaire and expound the simple method of calculating and testing the intraclass correlation coefficient (ICC), the authors gave an example of how to simply calculate and conduct the hypothesis testing of ICC by using the analysis table of variance. The results demonstrated a high test retest reliability of the illustrative questionnaire. By using ANOVA table, the calculation and hypothesis testing of the ICC is easy to do. The method can be used in the analysis of quantitative data, and categorical data as well.
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