STA 2023 Lecture Notes - Lecture 8: Bar Chart, Frequency Distribution, Time Series
Document Summary
A bar chart displays the distribution of a qualitative variable, showing the counts for each category next to each other for easy comparison. A relative frequency bar chart displays the relative proportion of counts for each category. A pareto chart is used to represent a frequency distribution for a categorical variable, and the frequencies are displayed by the heights of the vertical bars, which are arranged sequentially from highest to lowest. When data are collected over a period of time, they can be represented by time series graph. A circle that is divided into sections or wedges according to the percentage of frequencies in each category of the distribution is called a pie graph. Pie graphs show the whole group of cases as a circle. They slice the circle into pieces whose size is proportional to the fraction of the whole in each category.
