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So, what should you do? Choose which effect you are interested in, the
effect on the latent propensity (-probit-), the effect on the
probability for someone with typical values on the explanatory
variables (-mfx- or -margeff- with the -at(mean)- option), or the
effect on the probability for a typical person (-margeff- without the
-at(mean)- option). Choose your null hypothesis, typically that would
be that the effect of interest equals zero. Then report whether or not
you reject that hypothesis. (When we are saying that an effect is
significant, we are implicitly saying we went through all these steps
and concluded that we rejected the null hypothesis)."

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