the.com/deviation

The distance between what was planned and what actually happened to you.

means A departure or difference from an established course, standard, or expected value.

from From Latin deviare — de- 'away from' plus via 'way, road' — literally meaning to turn off the road. Latin writers used it for wandering travelers before it settled into English in the 1600s as a word for straying from a plan, path, or norm. The road never stopped being the image: to deviate is still, underneath, to leave the highway.

statistics use
measures how spread out data points are
standard version
square root of the variance, basically
etymology
from latin deviare, to turn off the road
zero deviation
means either perfection or a boring dataset
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