[R] Plot(x,y) help

[YAddo]

Dear All:

I would any appreciate any help with this plot I am struggling with.

I have 4 estimates (95% CIs) I want to plot. I want the CI lines to be
horizontal on each plotted point. I was trying to tweak some old codes  (was
for a vertical CI  lines) into horizontal but not much dice. 

Many thanks in advance for your help.

YA


My working codes:

x=c(1,1,1,1.1,1.1,1.1,2,2,2,2.1,2.1,2.1)
y=c(1.73,1.30,2.30, 1.83,1.36,2.45,1.46,1.07,2.00,1.58,1.15,2.17)

ptidx = seq(1,12,by=3)
lciidx = seq(2,12,by=3)
uciidx = seq(3,12,by=3)

plot(x,y, type="n",axes=F, xlab="PR(95% CI)",ylab=" ")

points(x[ptidx],y[ptidx],pch=19,cex=4.5)
points(x[lciidx],y[lciidx],pch="_",cex=4.5)
points(x[uciidx],y[uciidx],pch="_",cex=4.5)
box()

for(i in 1:4)
{
 
lines(c(x[lciidx[i]],x[uciidx[i]]),c(y[lciidx[i]],y[uciidx[i]],lwd=4,cex=4.5))
  
}






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