F
First filial (son or daughter) hybrids arising from a first cross. Subsequent generations are denoted by

,

etc.
"Symbol and abbreviation of farad, and symbol and abbreviation of the Faraday number. (Often a ""bold-face"" letter is used for the latter, but this is not a general practice.) It is usually obvious from the context which meaning is appropriate. "
(f) Prefix used in the
SI system meaning "multiply by 10
-15". For example 22 fg means 22× 10
-15 g.
This standardized measure of effect size is used in the Analysis of Variance to characterize the overall level of population effects, and is very similar to the
RMSSE . It is the square root of the sum of squared standardized effects divided by the number of effects. For example, in a 1-Way ANOVA, with J groups, f is calculated as

For more information see the chapter on
Power Analysis .
Fahrenheit. Measure of temperature where water freezes at 32' and boils at 212'.