Statistics

Statistics

1. Tests of Differences

   • Parametric
     • Independent t-test
       • 2 groups.
       • Between groups
     • Paired t-test
       • 2 groups
       • Within groups
     • ANOVA
       • 2+ groups
       • Only tells you there's a difference, not where the difference is.
   • Nonparametric
     • Wilcoxon Rank Sum
       • 2 groups
       • Between groups
     • Kruskal-Wallis
       • 3+ groups
       • 1 dependent variable or outcome

2. Tests of Relationships

   • Parametric
     • Pearson Product
       • 2 variables
       • Ratio or interval data
     • ICC
       • 3+ variables
       • Ratio or interval data
     • Linear Regression
       • Predictive
       • Prognosis studies
       • Dependent variable is interval or ratio
     • Multiple Linear Regression
       • Predictive
       • 2+ variables
       • Dependent variable is interval or ratio
       • Independent variable may be nominal, interval or ratio
   • Nonparametric
     • Chi-Square Test of Independence
       • 2 variables
       • Case-control
       • Nominal data
     • Spearmann Rank
       • 2 variables
       • Reliability of measures
         • Association between variables
       • Ordinal data
     • Kappa
       • 3+ variables
       • Reliability of repeated measures
       • Nominal data
     • Logistic Regression
       • Prognosis
       • Dependent variable is nominal
       • Independent variable is nominal, interval or ratio
     • Multiple Logistic Regression
       • 2+ variables
       • Prognosis
       • Dependent variable is nominal
         • Independent variable is nominal, interval or ratio