TL;DR: Want to summarize a whole data set in one quick picture? A box plot does it with just five numbers: minimum, Q1, median, Q3, and maximum. The box itself stretches from Q1 to Q3 with a line at the median, giving you the middle 50 percent of your data at a glance. Whiskers reach […]
TL;DR: Two classes can have the same average and still feel completely different — one tightly clustered, one all over the map. Mean absolute deviation, or MAD, is how you measure that spread. Subtract the mean from each value, take the absolute value so you only care about distance (not direction), then average those distances. […]
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