Exploring & Describing Data
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  • Introduction    • Distributions    • Graphical Techniques    • Numerical Summaries    • Lecture 1: Using Graphs to Analyze Data    • Transcript of Lecture 1
   

Numerical Summaries

Numerical summaries examine a single aspect of the distribution. Partly because this is an extremely severe paring down of information, you should always make a graph of the data first. Otherwise, there is a danger that you will throw away important information if you pay attention to only the numerical summaries.
The two most important aspects of the distribution that we summarize: center and spread.