STAT1008 Chapter Notes - Chapter 2: Exploratory Data Analysis, Pie Chart, Bar Chart
Document Summary
In order to make sense of data, we need ways to summarise and visualise it. Summarising and visualising variables and relationships between two variables is often known as descriptive statistics ( exploratory data analysis) Type of summary statistics and visualisation methods depend on the type of variables being analysed ( categorical or quantitative) A frequency table shows the number of cases that fall in each category. The proportion in a category is found by : p= number in that category/ total number. A relative frequency table shows the proportion of cases that fall in each category. All numbers in a relative frequency table sum to 1. In a barplot, the height of the bar corresponds to the number of cases falling in each category. In a pie chart, the relative area of each slice of the pie corresponds to the proportion in each category.
