Negative Skew/Kurtosis Values
what do I do if I get negastive values for skew or kurtosis, when the errors for either/both are positive? Dividing it out to get the z will always result in something less than 3.8 or 3.3 or 2.5 (e.g. 10 divided by -0.5 = -20, a large number, but still less than the significance values). Is it an absolute values thing? Did I do something wrong? Do I even need to worry about this?
posted by Unknown @ 10:29 AM
1 Comments:
At 5:48 PM,
Mari Clements said…
The critical value for z is +/-. That is, you can have either significant positive skew (by exceeding 2.58 or 3.80) or significant negative skew (by exceeding -2.58 or -3.80).
z scores, like t scores, indicate the direction of the deviation from what would be expected if there were no difference.
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