Definizione monolingua

sigma

sigma (plural sigmas)

1. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
2. (mathematics) The symbol ?, used to indicate summation of a set or series.
3. (statistics) The symbol ?, used to indicate one standard deviation from the mean, particularly in a normal distribution.
   • 2011, Paul Rincon, (bbc.co.uk) LHC: Higgs boson may have been glimpsed

     None of the spikes seen by the experiments is at much more than the ""two sigma"" level of certainty.
     A level of ""five sigma"" is required to claim a discovery, meaning there is less than a one in a million chance the data spike is down to a statistical fluke.

Definizione dizionario sigma

sigma

Altri significati:

The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.

letter of the Greek alphabet

(statistics) The symbol ? , used to indicate one standard deviation from the mean, particularly in a normal distribution.

(mathematics) The symbol ? , used to indicate summation of a set or series.