topic PROC REG for full quadratic model in SAS Programming

PROC REG for full quadratic model

JUMMY — Wed, 30 Jan 2019 03:02:54 GMT

How do I write a prediction equation only for the full quadratic model that contains the two linear terms (main effects), the two quadratic terms, and the interaction using PROC REG for the data below?

data brand;
	input preference moisturecontent sweetness @@;
	datalines;
	64 4 2 73 4 4 61 4 2 76 4 4 72 6 2 80 6 4 
	71 6 2 83 6 4 83 8 2 89 8 4 86 8 2 93 8 4
	88 10 2 95 10 4 94 10 2 100 10 4
	;
run;
proc print;
run;

proc reg data=brand;
 model preference=moisturecontent sweetness;
 by make;
run;

Re: PROC REG for full quadratic model

PGStats — Wed, 30 Jan 2019 03:34:17 GMT

Get the regression estimates from:


proc rsreg data=brand;
 model preference=moisturecontent sweetness / nooptimal;
run;

Use

ODS OUTPUT parameterEstimates=myEstimates;

to transfer the estimates to a dataset.

Re: PROC REG for full quadratic model

JUMMY — Wed, 30 Jan 2019 03:52:37 GMT

@PGStats, how do I use PROC REG instead of PROC RSREG?

Re: PROC REG for full quadratic model

PGStats — Wed, 30 Jan 2019 03:56:27 GMT

With proc reg, you will need an extra datastep to create the quadratic terms variables before calling the procedure.

Re: PROC REG for full quadratic model

JUMMY — Wed, 30 Jan 2019 03:59:00 GMT

@PGStas, can you kindly show me how its done?

Re: PROC REG for full quadratic model

PGStats — Wed, 30 Jan 2019 04:05:52 GMT

Give it a try yourself and come back here if you encounter problems. You will learn more that way.

Re: PROC REG for full quadratic model

JUMMY — Wed, 30 Jan 2019 04:13:11 GMT

@PGStats , I tried the code below:

proc reg data=one;
 model preference=moisturecontent*moisturecontent sweetness*sweetness 
							moisturecontent*sweetness;
run;

And keep getting this error:

10   proc reg data=one;
11    model preference=moisturecontent*moisturecontent sweetness*sweetness
                                      -
                                      22
                                      76
ERROR 22-322: Syntax error, expecting one of the following: a name, ;, -, /, :, _ALL_,
              _CHARACTER_, _CHAR_, _NUMERIC_, {.
ERROR 76-322: Syntax error, statement will be ignored.
12                               moisturecontent*sweetness;
NOTE: The previous statement has been deleted.
13   run;

Re: PROC REG for full quadratic model

PGStats — Wed, 30 Jan 2019 05:29:43 GMT

As I mentioned above, you need an extra datastep to create the quadratic terms variables before calling the procedure.