Parametric Statistical Analysis
- Refers to the use of statistical tests or methods when the data being studied comes from a sample or population of people that is normally distributed.
- Assumes patient population being studied is normally distributed
- Assumes the variance is homogeneous
- Type of data: interval or ratio. Sometimes referred to as continuous variables/data.
- Interval scale data:
- When numbers have units that are of equal magnitude as well as rank order on a scale without an absolute zero
- Ratio scale data:
- When numbers have units that are of equal magnitude as well as rank order on a scale with an absolute zero
- The usual central measure is a mean
- T-test (assumes 2 independent groups (i.e., not related) being studied)
- One-way ANOVA (assumes > 2 independent groups being
- Pearson (correlation test)
- One-way ANOVA
- Nonparametric Statistical Analysis
- Gaddis ML et al. Introduction to biostatistics: part 1, basic concepts. Ann Emerg Med 1990;19:86-89.