Kurtosis Calculation

[George Self]

Can someone tell me if the kurtosis calculation done by Sofastats in the normality check is a simple kurtosis (normal distribution has kurtosis of 3) or an excess kurtosis (normal distribution has a kurtosis of 0)? I suspect it's an excess kurtosis since the calculated value for Age in the demo_tbl comes up -1.177 and that would seem to be a bit low for a simple kurtosis calculation. Thanks for any help you can provide on this.

[Grant Paton-Simpson]

Hi George,

It uses Fisher's definition, which subtracts 3.0 from the result to give 0.0 for a normal distribution. See https://git.launchpad.net/sofastatistics/tree/sofastats/core_stats.py#n2172

All the best,
Grant

On 23/11/16 01:10, George Self wrote:

Can someone tell me if the kurtosis calculation done by Sofastats in the normality check is a simple kurtosis (normal distribution has kurtosis of 3) or an excess kurtosis (normal distribution has a kurtosis of 0)? I suspect it's an excess kurtosis since the calculated value for Age in the demo_tbl comes up -1.177 and that would seem to be a bit low for a simple kurtosis calculation. Thanks for any help you can provide on this.

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[Self, George]

Thanks. I appreciate the update. I also appreciate the tweet. I'll keep my work updated from semester to semester and post the latest version for folks to use.

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George Self
Dean, Extended Learning
se...@cochise.edu
(520) 335-1365
Cochise College
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