R help - Aug 2010 - How to obtain the graph of fitted values against one variable after estimation?

Hi there,

I have a question regarding the "plot" command after estimation.

Specifically, I estimate a model, say regressing y on x and z. And
after estimation, I would like to plot the fitted values against x,
but I don't need that for z. The following command always gives two
graphs, for both variables x and z.

plot.np<-plot(model, plot.errors.method = "asymptotic")

My question is, what option should I specify in order to get the graph
for x only?

I know this is probably a very simple question, but I searched around
for a while without any luck. Thank you for your time.

Best,
Le

On Aug 25, 2010, at 10:46 PM, Le Wang wrote:
> Hi there,
>
> I have a question regarding the "plot" command after estimation.
>
> Specifically, I estimate a model, say regressing y on x and z. And
> after estimation, I would like to plot the fitted values against x,
> but I don't need that for z. The following command always gives two
> graphs, for both variables x and z.
>
> plot.np<-plot(model, plot.errors.method = "asymptotic")
>
> My question is, what option should I specify in order to get the graph
> for x only?
Pick a constant value for "z" and vary "x" in a dataframe
that you
offer to the newdata argument of predict.

?predict

Then plot those values versus x.
>
> I know this is probably a very simple question, but I searched around
> for a while without any luck. Thank you for your time.
-- 

David Winsemius, MD
West Hartford, CT