math-lab

fairness · counting · statistics

Benford's law

In real lists, 1 is a first digit more often than 9.

Look at the first digits. Which digit shows up most?

The coral figure is the first digit. A list that spreads across many sizes is not the same as counting 1, 2, 3.

Lock a share, then read the list.
—1s on this sheet
—1s in the long list
—Long-run share of 1s

The first digit is the leftmost figure. 148 and 19 both start with 1.

Numbers that spread across many sizes put 1 first more often than 9. A plain count does not.