心理学课堂 How to distinguish negative and positive skewing

myflowerlove

我们常常分不清正偏态与负偏态以及为什么这样称呼。下面这段话给了我们启示。



   Negative Skew?
Why is it called negative skew? Because the long "tail" is on the negative side of the peak.

People sometimes say it is "skewed to the left" (the long tail is on the left hand side)

The mean is also on the left of the peak.

  
Positive Skew?
And positive skew is when the long tail is on the positive side of the peak, and some people say it is "skewed to the right".

The mean is on the right of the peak value.

reference： http://www.mathsisfun.com/data/skewness.html