Analyzing Continuous Data: Methods and Tools
Explore techniques for analyzing continuous data, including summarization, hypothesis testing, and comparison between groups. Learn about parametric and non-parametric methods, correlation analysis, and incorporating covariates. Discover helpful functions and tools for statistical analysis.
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Presentation Transcript
Asking Questions of Continuous Data If Normal, summarize by mean, SD, CV > Two Groups: cu1way (ebars=1-3) n>1? 1-sample t vs pop.mean >1 Var? Pearson If not Normal, summarize by median, IQR Two Groups: Wilcoxon rank sum n>1? Wilcoxon signed rank vs pop.median >1 Variable? Spearman 2-Tx Crossover? Wilcoxon signed rank >2-Tx Crossover? Friedman Two Groups: unpaired t > Two Groups: cu1way (ebars=4) One Group: n=1? z-score One Group: n=1 subject? percentile >2-Tx Crossover? curepmeas 2-Tx Crossover? paired t What If Other Factors, Covariates? 2 factors? cu2way 1 factor+1 covariate? cucov1way 2 factors+1 covariate? cucov2way 2 factors? curepmeas Calculate change; cu2way etc as on right What If Other Factors, Covariates? Can t do.
Extending 2x2 Analysis cu1way,cu2way,curepmeas biomath.net/stat/, Control Case Risk Factor Low Risk Factor High What If >1 Factor? Time to Caseness? Censored Data? Logistic Regression culogist Kaplan-Meier Analysis cukm If >1 factor AND time to caseness Cox Proportional Hazards Modeling cucox
11 useful cufunctions 1. curead read data (remember to attach for 2-6,10) 2. cutable1 summary statistics 3. cu1way one factor - one-way anova (generalizing unpaired t, Wilcoxon), contingency tables 4. cu2way 2 factors - two-way anova, contingency tables 5. cucov1way one factor with a continuous covariate (analysis of covariance, ancova) 6. cucov2way two factors with a continuous covariate (analysis of covariance, ancova) 7. curepmeas one factor, repeated within subject (generalizing paired t), possible 2nd, possible covariates 8. cumreg multiple regression 9. culogist logistic regression, summary table, ROC 10.cukm Kaplan-Meier analysis 11.cucox Cox modeling (best model found for 7,8,9,11)
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