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Descriptive statistics summarize features of a sample, such as mean and standard deviations, median and quartiles, the maximum and minimum. With multiple variables, may include correlations and crosstabs. Can include visual displays - boxplots, histograms, scatterplots and so on.
7
votes
Accepted
War stories where wrong decisions were made based on statistical information?
This isn't exactly what you're asking for, but I think you'd like David Freedman's work. He calls BS on misapplication of statistical tests, etc... See here: http://www.stat.berkeley.edu/~freedman/. O …
1
vote
Measure of closeness
I'd use standard deviation, like shabbychef said. See http://en.wikipedia.org/wiki/Variance to learn more.