weighted_test: Estimate p-value with non-uniform probabilities of treatment...
In ebenmichael/ents: Maximum Entropy Synthetic Controls

Estimate p-value with non-uniform probabilities of treatment with SCM weights

1 2	weighted_test(metadata, fitfunc, units, probs, trt_unit, pretimes, posttimes, statfuncs)

`metadata`	with treatment time
`fitfunc`	Partially applied fitting function which takes in the number of the treated unit
`units`	Numbers of the units to permute treatment around
`probs`	Propensity scores
`trt_unit`	Treated unit
`pretimes`	Vector of times in pre-period
`posttimes`	Vector of times in post-period
`statfuncs`	Function to compute test stats