Dear Researchers,

sorry for this simple question. I  have a point plot with mean values and i
wish to plot line with Standard Deviation as "Whiskers". I calculate the
mean+sd and mean-sd, but i can not figure out the way to add the line.

mydata <-
data.frame(mean=c(0.42,0.41,0.41,0.43,0.45,0.43,0.43,0.42,0.44,0.45,0.45,0.45,0.46,0.43,0.42,0.37,0.44,0.46,0.46,0.39,0.40),

sdUP=c(0.58,0.56,0.55,0.57,0.61,0.55,0.57,0.59,0.61,0.60,0.57,0.60,0.62,0.57,0.59,0.56,0.57,0.61,0.61,0.56,0.54),

sdDOWN=c(0.26,0.26,0.28,0.29,0.30,0.30,0.29,0.26,0.28,0.31,0.34,0.30,0.31,0.30,0.25,0.19,0.31,0.31,0.31,0.22,0.25))

plot(mydata$mean,
    type="o",
    ylab="mean",
    xlab="class")

thanks in advance and sorry for any disturb

Gianni

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