My guess is that this should be something like "If you have n significant digits in your evaluation metric, you should have at least 10^(n+1) data points."
Avoiding the term “significant digits” completely: Distinguishing 91 vs 90 is a difference of 1 on a 0-100 scale. 100x10=1000. If you wanted to distinguish 91.0 vs 90.9, that’s 1 on a 0-1000 scale, so you’d want 10,000 points.
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My guess is that this should be something like "If you have n significant digits in your evaluation metric, you should have at least 10^(n+1) data points."
Avoiding the term “significant digits” completely: Distinguishing 91 vs 90 is a difference of 1 on a 0-100 scale. 100x10=1000. If you wanted to distinguish 91.0 vs 90.9, that’s 1 on a 0-1000 scale, so you’d want 10,000 points.