Biostatistics for the Clinician## Biostatistics for the Clinician

## University of Texas-Houston

Health Science Center## Lesson 1.4

## Variability

Lesson 1: Summary Measures of Data 1.4 - 1

Biostatistics for the Clinician## 1.4 Variability

## 1.4.1 Why Important

Why do you need to know about measures of variability? You need to be able to understand how the degree to which data values are spread out in a distribution can be assessed using simple measures to best represent the variability in the data. Why? Because, measures of variability also occur very frequently in the medical research literature. Again, as was the case with measures of central tendency, you cannot understand, let alone critically evaluate medical research studies unless you understand the appropriate usage of such measures.