1. Center, Shape, Spread
2. For dummy code, we have to ensure that the data type is Categorical (by astype(category)), otherwise, the result will be meaningless.
3. For Quantitative Variables: Histograms, exact measures of shape, center and Spread
4. For Categorical Variables: Frequency distributions; Bar Chart
5. 注意，factorplot 中的y 取的是平均值。如果想看回归趋势，应该用regplot
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