Quantile-Quantile
Example 1:
Data of one attribute  :  20, 40, 60, 185
The plot does not produces an approximately straight line, suggesting that the two sets of sample data does not  have the same distribution.
Data of one attribute  :  20, 40, 60, 185
The plot does not produces an approximately straight line, suggesting that the two sets of sample data does not  have the same distribution.