topic Re: coding for median regression in Statistical Procedures

coding for median regression

lmyers2 — Thu, 07 Dec 2017 01:02:47 GMT

Hello,

I'm using SAS 9.4 full edition. I am trying to do a median regression analysis. I pasted the base code below but it's not working. I also pasted the error messages below.

proc quantreg ci=resampling;

class VARIABLE1 (param=ref ref='CONTROL');

model COST=VARIABLE1 VARIABLE2 VARIABLE3 / quantile=0.25 0.5 0.75; 

run;

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.

Thanks very much in advance for the help!

Best

Laura

Re: coding for median regression

WarrenKuhfeld — Thu, 07 Dec 2017 01:14:53 GMT

http://support.sas.com/documentation/cdl/en/statug/68162/HTML/default/viewer.htm#statug_qreg_syntax03.htm

Different procedures have different CLASS statements due to historical evolution. You are specifying options that do not exist in quantreg. I provide a link to the syntax.

Re: coding for median regression

lmyers2 — Thu, 07 Dec 2017 01:27:05 GMT

Thanks - the manual doesn't mention how to program the reference group though using class statement in proc quantreg. Would someone mind posting sample code?

Best

Laura

Re: coding for median regression

WarrenKuhfeld — Thu, 07 Dec 2017 01:40:58 GMT

You can't. You can change the level in a data step. Prepend a 'Z' or something to the level you want to be the last level so it sorts last.