Categorical Outcomes Greatly Affect Statistical Power in Applied Research

Categorical outcomes decrease statistical power due to a lack of precision and accuracy in measurement. http://www.scalelive.com/statistical-power-and-categorical-outcomes.html
#statistics #research #science #measurement #education #tutorial

Use and Interpret Phi-Coefficient in SPSS

Phi-coefficient is the statistical test used when correlating two categorical variables. http://www.scalelive.com/phi-coefficient.html #statistics #correlation #research #science #education #tutorial #spss

Observational Research Designs Have Utility and Relevance

Observational research designs are very feasible for busy clinicians. http://www.scalelive.com/observational-research-designs.html
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Generate Known-Groups Validity Evidence For Your Survey

Known-groups validity evidence is found when a survey can differentiate between independent groups. http://www.scalelive.com/known-groups-validity.html
#statistics #psychometrics #research #science #validity #education #tutorial

Experimental Research Designs Yield Causal Effects

Experimental research designs can yield causal effects. http://www.scalelive.com/experimental-research-designs.html #research #science #medicine #tutorial #education

Increase the Validity of Statistical Findings Using Bootstrap, Split-Group, or Jack-Knife Methods

Strengthen statistical findings using validation methods like bootstrap, split-group, and jack-knife. http://www.scalelive.com/validation-of-statistical-findings.html
#statistics #research #science #education #tutorial

How is stratified randomization used in experimental research?

Use stratified randomization with an experimental research design. http://www.scalelive.com/stratified-randomization.html #research #science #tutorial