[R] Scatter plot / LOESS, or LOWESS for more than one parameter

[R. Michael Weylandt]

The scatter plot is easy:

plot(pH1 ~ pH2, data = OBJ)

When you say a loess for each -- how do you break them up? Are there
repeat values for pH1? If so, this might be hard to do in base
graphics, but ggplot2 would make it easy:

library(ggplot2)
ggplot(OBJ, aes(x = pH1, y = pH2)) + geom_point() + stat_smooth() +
facet_wrap(~factor(pH1))

or something similar.

Michael

On Mon, Apr 23, 2012 at 11:26 PM, David Doyle <kydaviddoyle at gmail.com> wrote:
> Hi folks.
>
> If I have the following in my "data"
>
> event    pH1    pH2
> 1            4.0     6.0
> 2            4.3     5.9
> 3            4.1     6.1
> 4            4.0     5.9
> and on and on..... for about 400 events
>
> Is there a way I can get R to plot event vs. pH1  and event vs. pH2 and
> then do a loess or lowess line for each??
>
> Thanks in advance
> David
>
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