STAT 301 Lecture Notes - Lecture 8: Bar Chart, Box Plot, Categorical Variable
Document Summary
The difference between a histogram and a bar chart is: With bar charts, each bar represents a different distinct group. With histograms, each bar represents a the number of observations which fall into an interval, also known as a bin. As with bar charts, the height of each bar corresponds to either frequency or relative frequency. The number of bins on a histogram is arbitrary. The larger the bin size, the fewer bins there will be. Changing the number of bins can produce different looking histograms, even if the underlying data is exactly the same. *if an observation falls directly on a bin endpoint, it is typical to place that observation in the bar to the left of its value. This is not a hard and fast rule. Used to display the distribution of quantitative variables. The shape of the distribution as well as the presence of any possible outliers is easily discerned from the boxplot.
