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Understanding Clinical Trial Design - Research Advocacy Network

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UNDERSTANDING CLINICAL TRIAL DESIGN: A TUTORIAL FOR RESEARCH ADVOCATES<br />

Variability The degree to which a set of outcomes is dispersed or<br />

scattered. Two sets of outcomes with identical means<br />

(averages) may have widely different variances. The usual<br />

measures of variability are the variance and standard<br />

deviation.<br />

Variance Measure of dispersion calculated in samples and used to<br />

estimate population variances. Computationally, the<br />

variance is equal to the average squared deviation from<br />

the mean.<br />

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