| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Outline of Final Research Achievements |
This study examined the factors and degrees of publication bias when single-case research design data are synthesized by the hierarchical linear models (HLM). Results can be summarized into the following three points: (1) Distributions of effect sizes of single-case designs that were reported in Japan were distorted, implying that the publication biases existed in these studies. (2) When subjects are screened by their pretest scores, treatment effects tend to be overestimated by the regression to the mean effect, and even non-effective treatments can be evaluated as largely effective. (3) When publications of the single-case studies depend on the statistical significance of the treatments and only published cases are used for meta-analyses by the HLM, originally non-effective treatments can be evaluated as if they were considerably effective ones.
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