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Parametric Statistical Analysis

    Definition
    • 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.
    Characteristics
    • 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
    Example Methods

    • T-test (assumes 2 independent groups (i.e., not related) being studied)
    • One-way ANOVA (assumes > 2 independent groups being studied/compared)
    • Pearson (correlation test)
    Related Content
    References
    1. Gaddis ML et al. Introduction to biostatistics: part 1, basic concepts. Ann Emerg Med 1990;19:86-89.
    Editors & Reviewers

    Editors:

    • Anthony J. Busti, MD, PharmD, FNLA, FAHA

    Last Reviewed: July 2015