Hi Rich,

Using the data set "iris" as an example, you might also try

require(car)
scatterplot(Petal.Length ~ Sepal.Length | Species, data = iris)

HTH,
Jorge


On Wed, Aug 31, 2011 at 4:50 PM, Rich Shepard <> wrote:

>  I've tried various commands. ?plot, Teetor's book, "R Cookbook", and
> Mittal's book, "R Graphs Cookbook" without seeing how to write the command
> to create scatterplots from my data.frame. The structure is:
>
>  str(chemdata)
>>
> 'data.frame':   14886 obs. of  4 variables:
>  $ site    : Factor w/ 148 levels "BC-0.5","BC-1",..: 104 145 126 115 114
> 128 124 2 3 3 ...
>  $ sampdate: Date, format: "1996-12-27" "1996-08-22" ...
>  $ param   : Factor w/ 8 levels "As","Ca","Cl",..: 1 1 1 1 1 1 1 1 1 1 ...
>  $ quant   : num  0.06 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 ...
>
>  and what I'd like to do is create scatter plots of quant (y-axis) against
> the factor site (x-axis) for specified param factors. Teetor has an example
> for a data set with two numeric variables and a single factor. I have a
> single numeric veriable, two factors, and a date.
>
>  I'll also want to create time series line plots of values as a function of
> date for specified params.
>
>  If the data.frame had only two columns all the examples work. But, using
> two columns (the number per site factor for only a specified param factor)
> is not covered in what I've read so far.
>
>  Other graphing resources about which I should know?
>
> Rich
>
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