Answer for How to determine the number of intervals

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Hi Gilles,

Thanks for reaching out.

In general we are looking for a representation that has between 5 and 20 intervals. 

To determine the skewness, I usually start with a histogram with many bins (e.g. 100-1000, depending on the size of the dataset). This gives a good feel about the frequency distribution of the dataset.

Afterwards, I’d normally get the bins down to 20 and see if the general trend remains.

Overall, I try to preserve the general trend while using as few bins as possible.

Best,

Iliya

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