Statistical Sciences 2037A/B Lecture Notes - Categorical Variable
15 Jan 2013
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Document Summary
Data should stand out, be clear, have a source, and have little extras. Categorical data can be laid out using things that divide them into categories and pictures. Precharts show the percentage of the whole that falls into each category. They are simple and show information more readily than a table. Bar graphs show percentages/frequencies as well, but they can show two or three categorical variables at a time. A third can be shown by adding another bar. Pictograms are like bar graphys, but they use pictures related to the topic of the graph. They are not the best because the picture can be misinterpreted by our eyes. Graphs are the best way to represent the relationship between 2 measurements. It also shows how a measurement variable changes over time. Scatter plots are useful for showing the relationship between 2 measurement variables. Each dot represents one individual unless 2 people have the same result.
