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statistics anova reporting guideline rstudio sample size observational study r power analysis bias strobe statement change point multilevel model effect size statistical analysis bayes single subject experimental design content validity multitrait multimethod structural equation modeling mvn mvoutlier simsem phase i/ii bayesian research design clinical trial mcmc bayesian estimation factor analysis hypothesis test structural validity cosmin precision power accuracy adaptive multiple regression accuracy analysis diagnostic accuracy stard2015 registration sensitivity and specificity 诊断精度 潜在クラス latent class 构造方程式モデリング mplus latent structure 分类分析 taxometric categorical dimensional promis linking equating dif irt cat medelian randomization instrumental variable causal inference risk of bias robans 観察研究 sample size estimation confounding lessr