An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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root-mean-square value
  ارزش ِ ریشه‌ی ِ چاروشی ِ میانگین  
arzeš-e riše-ye câruši-ye miyângin
Fr.: écart quadratique moyen, écart type  

Statistics: The square root of the arithmetic mean of the squares of the deviation of observed values from their arithmetic mean.

See also: → root; → mean; → square;
→ deviation.