Dan_Moore comments on Pinpointing Utility - Less Wrong

57 [deleted] 01 February 2013 03:58AM

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Comment author: Dan_Moore 13 February 2013 04:05:36PM 2 points [-]

Why are some unit systems "dimensionless", and others not?

Some ratios are dimensionless because the numerator and denominator are in the same dimension, so they cancel. for example, a P/E (price to earnings) ratio of a stock. The numerator & denominator are both in $ (or other currency).