Natural direct effect
= Natural direct effect
One <natural direct effect> is
$$
\mathbb E[Y(1,M(0))-Y(0,M(0))],
$$
which changes <exposure> while holding the mediator at its natural value under no <exposure>.
= Natural direct effect
One <natural direct effect> is
$$
\mathbb E[Y(1,M(0))-Y(0,M(0))],
$$
which changes <exposure> while holding the mediator at its natural value under no <exposure>.