Calculate the effect size for regression analysis (Cohen 1992) known as Cohen's f^2.

`calculatef2(.object = NULL)`

- .object
An R object of class cSEMResults resulting from a call to

`csem()`

.

A matrix with as many rows as there are structural equations. The number of columns is equal to the total number of right-hand side variables of these equations.

Cohen J (1992).
“A power primer.”
*Psychological Bulletin*, **112**(1), 155--159.