Calculate the gradient of the proportion mediated for yreg logistic case.

grad_prop_med_yreg_logistic(pnde, tnie)

## Arguments

pnde

A numeric vector of length one. Pure natural direct effect.

tnie

A numeric vector of length one. Total natural indirect effect.

## Value

A numeric vector of length two. Gradient of the proportion mediated with respect to pnde and tnie.