This document provides an introduction to basic concepts in biostatistics including:
1. Biostatistics is the analysis and interpretation of data to objectively evaluate conclusions.
2. The unit of analysis refers to what or who is being studied, such as individuals in a study.
3. Variables are logical groupings of attributes that can take on different values or categories. The level of measurement of a variable, such as nominal or interval, determines what types of analyses can be used.