**Science / Chemistry / Standard Deviation:** The standard deviation is a statistical measure of precision. The best estimate of the standard deviation s for small data sets is calculated using formula for standard deviation where xi is the measurement from the i-th run, x-bar is the mean of all the measurements, and N is the number of measurements. For very large data sets, the standard deviation is the root-mean-square deviation from the true mean, and is usually written as sigma to distinguish it from the best estimate standard deviation s used for small data sets.

**Standard Noun Synonyms**: criterion, measure, benchmark, model, pattern, archetype, touchstone, yardstick, gauge, guide, guideline, paradigm, paragon, exemplar, example, sample, type, ideal, beau id‚al, rule, canon, law, requirement, precept, principle

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Science / Chemistry / Relative Standard Deviation: The relative standard deviation is a measure of precision, calculated by dividing the standard deviation for a series of measurements by the average measurement. MORE

Business / Finance / Standardized Value: A normal distribution with a mean of 0 and a standard deviation of 1. MORE

Business / Finance / Standard Error: The square root of the variance. A measure of dispersion of a set of data from its mean. MORE