The standard deviation is defined as the Square Root of the Variance,

(1) |

(2) |

The square root of the Sample Variance is the ``sample'' standard deviation,

(3) |

(4) |

Physical scientists often use the term Root-Mean-Square as a synonym for standard deviation when they refer to the Square Root of the mean squared deviation of a signal from a given baseline or fit.

© 1996-9

1999-05-26