Forest plot of the just-identified estimates \(\hat\beta_k\) (one per instrument) with confidence intervals, ordered by size, against the precision-weighted mean (dashed line). Wide, mutually inconsistent estimates signal a failure of the exogeneity assumption or treatment-effect heterogeneity (see [ssb_overid()]). Point size is the first-stage F; the axis is trimmed to the bulk since weak instruments have very wide intervals.
Arguments
- x
An [ssb_overid()] object.
- level
Confidence level for the per-instrument intervals.
- xlim
Optional `c(lo, hi)` for the horizontal axis. By default the axis is trimmed to the bulk of the estimates because weak single-share instruments have very wide intervals; widen it here to show more of them.
- title
Optional plot title.
- ...
Unused.