Hello All,

Many thanks to the help I have received so far.


Here is an example data set I hope to plot

Data1
  Year Data   SE
1 2005    2 0.01
2 2006    4 0.01
3 2007    5 0.01
4 2008    2 0.01
5 2009    3 0.01
6 2010    6 0.01


Data2
  Year Data SE
1 2006   32  1
2 2007  100  2
3 2008   60  4
4 2009   67  3
5 2010    8  1


Notice Data2 has one less years worth of data than Data1 (which is my
problem)

I am fond of using plotCI as it makes creating error bars and offsetting
overlapping error bars so easy, and double y-axis plots are a breeze

library(plotrix)
library(gplots)
offset=.08

plotCI(x=Data1$Year, y=Data1$Data, uiw=Data1$SE,lty=1,sfrac=.005, type="l",
gap=0, col="red", xlab="YEAR")

par(new=TRUE)

plotCI(x=(Data2$Year) +offset, y=Data2$Data, uiw=Data2$SE,lty=1,sfrac=.005,
type="l", gap=0, col="blue", xaxt="n",yaxt="n",xlab="",ylab="")

axis(4)




This above code is sooo close to what I want. It creates a plot where even
though one data set contains much larger numbers than the other, both fit
on the same plot without me having to manually adjust the Y axis. And the
generating the second Y-axis is simple. But my problem is with the x axis

The issue is that because the two Data sets are not the same size, the
Data2 line gets stretched along the x-axis in the plot to cover the missing
first year. So it looks like Data2 has data in 2005.

I can't plot the Data2 line by the year in Data1 aka (
plotCI((x=(Data1$Year) +offset, y=Data2$Data.......) because the data are
not of equal size

I was thinking something along the line of pulling out the matching years
such as (   plotCI(x=(Data1[c(2:6),1])+offset, y=Data2$Data.......)  but I
could not get it to work.


Any suggestions will earn you well earned programing karma and many thanks
from me.

Cheers

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