title: metafor: Including data in forest plot but not meta-analysis model
body: <p>I haven't been able to find an answer to this question, but I hope it's not hard. </p>
  
  <p>I'm conducting a metaanalysis and would like to include a study in the forest plot but exclude it from the meta-analytic estimate of the effect size. That is, I want to include that study for comparison purposes but do not want it to contribute to the actual meta-analysis. </p>
  
  <p>This is an odd case in which we have ~30 studies that used identical protocols. They are all direct replications of an original study. I want to include the original study in the forest plot for comparison purposes, but do not want to include it in the meta-analysis of the ~30 new studies. I saw that it's possible to deal with missing data (<a href="https://stackoverflow.com/questions/23472001/excluding-missing-variables-in-forest-plots-in-meta">excluding missing variables in forest plots in meta</a>), but I don't see any way to specify rows of data to exclude from the model itself if I want to include them in the forest plot. Any suggestions?</p>