This function provides a visual overview (forest plot) of study-specific
noncompliance rates in both randomization arms.
Only studies with full compliance information are included in this plot
because noncompliance rates cannot be calculated without compliance data. In the generated
plot, the red dot with its horizontal line shows the study-specific noncompliance rate
with its 95% exact confidence interval for the patients randomized to the treatment arm,
and the blue square with its horizontal line represents that rate and interval for those
in the control arm. The confidence intervals are calculated by the Clopper--Pearson exact
method, which is based on the cumulative distribution function of the binomial distribution.