the F distribution is continuous curve and skewed to the right of the vertical axis, differing from t and chi-square distribution in that it has two parameters: one degrees of freedom( df ) for the numerator and the other for the denominator. It is always nonnegative.
F DISTRIBUTION
Meaning of F DISTRIBUTION in English
Sean Woo's Finance, GIS and real estate English glossary. Английский глоссарий по ГИС(Географическая информационная система) и недвижимости Sean Woo's Finance. 2012