Greek letter equivalent of s, written σ, commonly used to denote the standard deviation of a distribution or a set of data. The capital ∑ is used to denote the sum in the summation notation.
The symbol usually used to denote the standard deviation of a population; σ2 denoting the variance.
Symbol used to denote a sum. Thus
The sample mean for n observations x1, x2,…, xn is
and the unbiased estimate (see estimator) of the population variance is
- ISDN
- ISEE
- isentropic
- isentropic (isentropic surface)
- isentropic process
- ISF
- Ishmael effect
- Ishtar Terra
- ISI
- isidium
- Ising model
- Islam
- Islamic banking
- Islamic State
- island arc
- island-arc crustal type
- absorbing set
- absorbing state
- absorptance
- absorptance band
- absorption
- absorption coefficient
- absorption edge
- absorption indicator
- absorption laws