POL SCI 3 Lecture Notes - Lecture 25: Box Plot, Contingency Table, Scatter Plot
1 Dec 2016
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Chubby chev (chevychev) : almost all cases fall within 2 sds of the mean! Mean: 60 sd: 5, most cases between 50 to 70. If median and mode are very similar, there is not much skew in the data vs. if the median and mode is very different, skew in the data (asymmetry) Pulls in the direction where the outlying observations tend to be. When median and mean are the same and they are mirror images symmetry. Even when median and mean are the same, if they are not mirror asymmetry. Infer sd by chevychev (where do most cases fall, how far from mean) Whether median is greater or less than mean: median middle point, mean affected by outliers, pulls toward them. If this case is about outcome, can infer that there are some rich people in the dataset. Calculating standard deviation (1) value of variable minus the mean (2) square that value (3) divide by n (number of cases)
