wls_se_synth: Weighted Least Squares Standard Errors
In ebenmichael/ents: Maximum Entropy Synthetic Controls

Weighted Least Squares Standard Errors

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wls_se_synth(outcomes, metadata, trt_unit = 1, pred_int = F, hc = 0,
  cols = list(unit = "unit", time = "time", outcome = "outcome", treated =
  "treated"))

`outcomes`	Tidy dataframe with the outcomes and meta data
`metadata`	Dataframe of metadata
`trt_unit`	Treated unit
`pred_int`	Whether to add outcome control variance to make pred interval
`hc`	Type of HC variance estimate (-1 for homoskedastic)
`cols`	Column names corresponding to the units, time variable, outcome, and treated indicator