Good Morning:
I have attached a text file with one hundred thirty six observations. I would
like to create a qq plot with the following features:
1. Observed values on the y-axis.
2. Normal approximation line on the plot.
3. X-axis with vertical reference lines at the following percentiles of the
data: 1, 10, 20, 50, 80, 90 and 99.
4. Data appearing on the plot as distinct points.
I assume that qqmath (lattice) is the best approach to this although I have not
been able to sort out the proper syntax to yield the plot I'm after. I
understand how to determine the quantiles of the data, and I can use qqmath()
to generate a plot which has the observed values on the y-axis, and the plot is
based on a normal distribution, but beyond this I'm struggling.
I do not have the R Graphics text by or Visualizing Data by Bill Cleveland but
I have several other R books (Crawley, Ugarte et al, Braun/Murdoch, Rizzo, etc)
but coverage of the lattice package seems light.
I very much appreciate any help that could be offered.
Thank you.
Adam
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