[wintertime]

Why is the zero digit not listed?

I would think that would be important.

[Stosh]

“Why is the zero digit not listed?”

It would be for a Benford’s analysis of a second or third digit (and those predictions exist as well), but not for an initial digit, because of course if zero is the first digit in a numerical value, it doesn’t really signify anything and it’s just discarded.

[Svartalfiar]

Why is the zero digit not listed?

Because the only counting number that starts with a '0' is 0. Once you start counting, every number you count to starts with 1-9 (assuming base ten system).