topic Re: Contour plot of quadratic regression model in SAS Procedures

Contour plot of quadratic regression model

chowfar — Sat, 13 Aug 2016 00:53:44 GMT

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.

Re: Contour plot of quadratic regression model

PGStats — Sat, 13 Aug 2016 02:05:18 GMT

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

Re: Contour plot of quadratic regression model

chowfar — Sat, 13 Aug 2016 02:14:13 GMT

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

Re: Contour plot of quadratic regression model

PGStats — Sat, 13 Aug 2016 02:23:32 GMT

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

Re: Contour plot of quadratic regression model

chowfar — Sat, 13 Aug 2016 02:35:07 GMT

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;

Re: Contour plot of quadratic regression model

gergely_batho — Mon, 15 Aug 2016 12:38:07 GMT

You can save predictions of the model, then use proc g3d (and proc g3grid if needed).

Re: Contour plot of quadratic regression model

Rick_SAS — Mon, 15 Aug 2016 14:34:03 GMT

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.