# Introduction to turbulence/Statistical analysis/Generalization to the estimator of any quantity

Similar relations can be formed for the estimator of any function of the random variable say $f(x)$. For example, an estimator for the average of $f$ based on $N$ realizations is given by:
 $F_{N}\equiv\frac{1}{N}\sum^{N}_{n=1}f_{n}$ (2)