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deal with 异常值outlier
cut off the higher 25% and lower 25% tails of the…
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Outlier<Q1-1.5(IQR)
Q3+1.5(IQR)
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keep decrease the bin size,we will lose the shape of our distribution.
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the location of particular values on the X-axis is often described in terms of standard deviations away from the mean.
z=(x-u)/(standard deviation)
-----the number of standard deviations that each value from the mean
standardize the distribution标准化
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