# Graph the Distribution of a Variable

Learn how to graph the distribution of a variable using R.

## We'll cover the following

## Visualization with R

An important part of data analysis is visualizing the distribution of a variable of interest. We illustrate this by using R functions to graph the distribution of the `v1`

variable in the `vd`

dataset. How we graph `vd$v1`

depends on what type of variable we think it is either discrete or continuous. A **discrete variable** only takes on a finite number of values, such as gender, age, and the number of children in a household. In contrast, a **continuous variable** takes on an infinite number of possible values, even within a range, like weight, distance, and income. If we treat `v1`

as a discrete variable, we can use a frequency table and bar chart to demonstrate its distribution.

A **frequency table** displays data values of a variable and how often each value occurs. It’s often first used to examine the distribution of a discrete variable. In R, the `table()`

function computes the frequency count for each variable value. The R code and output are as follows:

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