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08-18-2009 06:01 PM

Hi All,

I ran a regression analysis that produced four different equations. I would like to produce one graphic using predicted values from the four equations.

Any help or advice is appreciated.

I ran a regression analysis that produced four different equations. I would like to produce one graphic using predicted values from the four equations.

Any help or advice is appreciated.

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08-19-2009 07:41 AM

You didn't say what PROC you are using. Assuming REG, the following code illustrates one approach (example with just two models but easily expanded) without any graph customizations:

proc reg data=test;

one: model y = x;

output out=pdata1 predicted=p1;

two: model y = x xsq;

output out=pdata2 predicted=p2;

run;

quit;

data plot;

merge pdata1 pdata2;

run;

proc gplot data=plot;

plot (p1 p2)*x/ overlay;

run;

quit;

proc reg data=test;

one: model y = x;

output out=pdata1 predicted=p1;

two: model y = x xsq;

output out=pdata2 predicted=p2;

run;

quit;

data plot;

merge pdata1 pdata2;

run;

proc gplot data=plot;

plot (p1 p2)*x/ overlay;

run;

quit;

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08-19-2009 02:25 PM

Hi KMG,

Thanks for your answer. I appreciate it.

As I said, I got four equations (by M ) from the four different methods and I would like to plot the predicted values from all the four equations in one graph, join them and show the trends. With your proposal SAS disabled the By statement.

Fernando.

proc reg outest=est1 outsscp=sscp1 data=WDDGS.fractionsWDDGS24;

by M;

eq1: model Y=PS;

eq2: model Y=PS PSSQ / r cli clm;

plot predicted.*pssq;

plot Y*PSsq='a' predicted.*pssq='p' u95.*pssq='u' l95.*pssq='1' / overlay;

run;

quit;

Thanks for your answer. I appreciate it.

As I said, I got four equations (by M ) from the four different methods and I would like to plot the predicted values from all the four equations in one graph, join them and show the trends. With your proposal SAS disabled the By statement.

Fernando.

proc reg outest=est1 outsscp=sscp1 data=WDDGS.fractionsWDDGS24;

by M;

eq1: model Y=PS;

eq2: model Y=PS PSSQ / r cli clm;

plot predicted.*pssq;

plot Y*PSsq='a' predicted.*pssq='p' u95.*pssq='u' l95.*pssq='1' / overlay;

run;

quit;