Inter Quartile Range

The Inter Quartile Range can be calculated from the 75% and 25% Quartiles like this:

It is quite robust against Outlier, just like the Median.

Python Implementation

def remove_outliers(values, threshold=1.5)

	IQR = quantile75 - quantile25

	values = values >= quantile75 + 1.5 * IQR
	values = values <= quantile25 1.5 * IQR
	return values