When working with categorical variables, frequency tables and graphs containing counts and percentages are appropriate summaries. For continuous variables, because there are typically so many unique values, that counts and percentages can quickly become less useful and unwieldy, so traditionally we turn to the mean as the summary statistic of choice, since it provides a single measure of central tendency. In this section, we will discuss two nodes, the Histogram and Means nodes, that allow you to investigate the distribution and relationships of continuous and categorical variables.