Binds a D3.js forest plot to MAIDR, generating the accessible data
representation.
A forest plot is a point-range chart of studies against a shared null line,
so selector matches one element per study exactly as
bindD3ErrorBar's does, and the bounds are the same absolute positions
on the value axis.
Three things make it a forest plot rather than an error bar, and each is what
a sighted reader takes from the drawing:
nullValue — the line at 1 (a ratio) or 0 (a difference). Whether a
study's interval crosses it is the result for that study, and the trace
announces the crossing. Without it, no claim about significance is made:
there is no default, because a ratio chart guessed at 0 would report every
study as not crossing.
weight — the marker area, which is a magnitude a reader is otherwise
never told; two studies whose intervals look alike can contribute wholly
differently to the result.
pooledSelector — the diamond at the bottom. It is drawn as a
different mark from the studies, so it is selected separately and appended
after them; it is not evidence, it is what the evidence came to, and
announcing it as one more study invites a reader to count it among them.
Binds a D3.js forest plot to MAIDR, generating the accessible data representation.
A forest plot is a point-range chart of studies against a shared null line, so
selectormatches one element per study exactly as bindD3ErrorBar's does, and the bounds are the same absolute positions on the value axis.Three things make it a forest plot rather than an error bar, and each is what a sighted reader takes from the drawing:
nullValue— the line at 1 (a ratio) or 0 (a difference). Whether a study's interval crosses it is the result for that study, and the trace announces the crossing. Without it, no claim about significance is made: there is no default, because a ratio chart guessed at 0 would report every study as not crossing.weight— the marker area, which is a magnitude a reader is otherwise never told; two studies whose intervals look alike can contribute wholly differently to the result.pooledSelector— the diamond at the bottom. It is drawn as a different mark from the studies, so it is selected separately and appended after them; it is not evidence, it is what the evidence came to, and announcing it as one more study invites a reader to count it among them.