如何結合metafor中的森林圖？

Question

假設下面的代碼（如http://www.metafor-project.org/doku.php/plots:forest_plot_with_subgroups給出）

library(metafor) 

### decrease margins so the full space is used 
par(mar=c(4,4,1,2)) 

### fit random-effects model (use slab argument to define study labels) 
res <- rma(ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat.bcg, measure="RR", 
      slab=paste(author, year, sep=", "), method="REML") 

### set up forest plot (with 2x2 table counts added; rows argument is used 
### to specify exactly in which rows the outcomes will be plotted) 
forest(res, xlim=c(-16, 6), at=log(c(.05, .25, 1, 4)), atransf=exp, 
     ilab=cbind(dat.bcg$tpos, dat.bcg$tneg, dat.bcg$cpos, dat.bcg$cneg), 
     ilab.xpos=c(-9.5,-8,-6,-4.5), cex=.75, ylim=c(-1, 27), 
     order=order(dat.bcg$alloc), rows=c(3:4,9:15,20:23), 
     xlab="Relative Risk", mlab="RE Model for All Studies", psize=1) 

### set font expansion factor (as in forest() above) and use bold italic 
### font and save original settings in object 'op' 
op <- par(cex=.75, font=4) 

### add text for the subgroups 
text(-16, c(24,16,5), pos=4, c("Systematic Allocation", 
           "Random Allocation", 
           "Alternate Allocation")) 

### switch to bold font 
par(font=2) 

### add column headings to the plot 
text(c(-9.5,-8,-6,-4.5), 26, c("TB+", "TB-", "TB+", "TB-")) 
text(c(-8.75,-5.25),  27, c("Vaccinated", "Control")) 
text(-16,    26, "Author(s) and Year",  pos=4) 
text(6,     26, "Relative Risk [95% CI]", pos=2) 

### set par back to the original settings 
par(op) 

### fit random-effects model in the three subgroups 
res.s <- rma(ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat.bcg, measure="RR", 
      subset=(alloc=="systematic"), method="REML") 
res.r <- rma(ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat.bcg, measure="RR", 
      subset=(alloc=="random"), method="REML") 
res.a <- rma(ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat.bcg, measure="RR", 
      subset=(alloc=="alternate"), method="REML") 

### add summary polygons for the three subgroups 
addpoly(res.s, row=18.5, cex=.75, atransf=exp, mlab="RE Model for Subgroup") 
addpoly(res.r, row= 7.5, cex=.75, atransf=exp, mlab="RE Model for Subgroup") 
addpoly(res.a, row= 1.5, cex=.75, atransf=exp, mlab="RE Model for Subgroup") 

此代碼提供了以下組合森林圖：

所以我的問題是如何去除總的相對風險，並在其相應的結果情節的最底部？換句話說，我只是想繪製一些森林地塊並在同一個地塊展示它們，但不想將它們結合起來並顯示結果結果。

Answer 1

在forest(...)部分，使用addfit=FALSE。然後你也想調整ylim的值。在這種情況下，ylim=c(1, 27)應該可以工作。