## Contour plot of quadratic regression model

Occasional Contributor
Posts: 5

# Contour plot of quadratic regression model

Hi, I want to know how can I get a contour plot of quadratic regression model in SAS 9.4. The proc glm does not give the contour plot automatically. Please help.

Posts: 5,543

## Re: Contour plot of quadratic regression model

If you don't have any CLASS effect in your model, you could possibly get contour plots with proc RSREG.

PG
Occasional Contributor
Posts: 5

## Re: Contour plot of quadratic regression model

Thanks for the reply. Can you please give an example? I mean sample SAS code with proc rsreg

Posts: 5,543

## Re: Contour plot of quadratic regression model

Example 85.1, in my version of the documentation, produces a contour plot.

PG
Occasional Contributor
Posts: 5

## Re: Contour plot of quadratic regression model

How can I get  three-dimensional surface plots of quadratic regression model in SAS?

model yield = t pr t2 pr2 tp;

where t= temperature ( values scaled to -1,0 and 1)

pr= pressure  ( values scaled to -1,0 and 1)

t2= t*t

pr2=pr*pr

tp=t*pr;

SAS Employee
Posts: 340

## Re: Contour plot of quadratic regression model

You can save predictions of the model, then use proc g3d (and proc g3grid if needed).
SAS Super FREQ
Posts: 4,247

## Re: Contour plot of quadratic regression model

As PGStats said, look at the doc for PROC RSREG. The Getting Started example looks similar to what you need.

This (untested) code might point you in the right direction:

proc rsreg data=Have plots(unpack)=surface(3d);

model yield = temperature pressure;

run;

Notice that the procedure automatically fits a quadratic model, so you do not need to specify the quadratic terms for temperature^2, pressure^2 or temperature*pressure.

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