Hi All,
I have a question about plotting a one-to-one line and x-and-y error bars on a
scatterplot for my data. I just can't seem to work it out!
I have data from an experiment with 7 different treatment levels with 3
replicates, that is set-out as follows:
Treatment Level Replicate Reponse-weight Covariate-weight
1 1 0.945 0.232
1 2 0.345 0.213
1 3 0.945 0.341
2 1 0.925 0.122
2 2 0.115 0.110
2 3 1.20 0.27
... and so on..... for the 7 different treatment levels (21 rows altogether)
I need to plot the means of each different treatment level on a scatterplot
(Response-weight on y-axis and Covariate-weight on x-axis). I then need a
one-to-one line added to the plot and x and y error bars. I have read the code
for x-and-y error bars in Crawley's R book where he creates a function to apply
the error bars - unfortunately, I can not understand how to adapt it to my
dataset so I'm hoping someone would advise me of the simplest way to do this.
So my questions are:
1) How do I plot x-and-y error bars to my scatterplot of the above data?
2) How do I add a one-to-one line?
Thank you - please let me know if I should provide anymore information.
Sarah
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