Hi, I have a sample of data (about a hundred numbers) and I would like to roughly estimate whether they follow a normal distribution or not. From what I understand, two useful parameters are the z-scores for skewness and kurtosis. According to

this site, for example, they are defined as

Z_skew = skew / Standard_Error(skew)

Z_kurtosis = kurtosis / Standard_Error(kurtosis)

I'm just a bit confused about this: how do I calculate the standard error of the skewness, or kurtosis?

Thanks

Bruno