topic Can we force the fitting coefficient be less than zero? in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/Can-we-force-the-fitting-coefficient-be-less-than-zero/m-p/135162#M36586 <HTML><HEAD></HEAD><BODY><P>In linear regression, can we possibly force the fitting coefficient be less than zero?</P><P></P><P>I am doing some analysis for price elasticity, a larger-than-zero-coefficient is usually doesn't make sense.&nbsp; This is the reason I am asking if we can force the fitting result of coefficient be less than zero.</P><P></P><P>Thank you.</P></BODY></HTML> Fri, 23 Jan 2015 15:16:38 GMT wutao9999 2015-01-23T15:16:38Z Can we force the fitting coefficient be less than zero? https://communities.sas.com/t5/SAS-Procedures/Can-we-force-the-fitting-coefficient-be-less-than-zero/m-p/135162#M36586 <HTML><HEAD></HEAD><BODY><P>In linear regression, can we possibly force the fitting coefficient be less than zero?</P><P></P><P>I am doing some analysis for price elasticity, a larger-than-zero-coefficient is usually doesn't make sense.&nbsp; This is the reason I am asking if we can force the fitting result of coefficient be less than zero.</P><P></P><P>Thank you.</P></BODY></HTML> Fri, 23 Jan 2015 15:16:38 GMT https://communities.sas.com/t5/SAS-Procedures/Can-we-force-the-fitting-coefficient-be-less-than-zero/m-p/135162#M36586 wutao9999 2015-01-23T15:16:38Z Re: Can we force the fitting coefficient be less than zero? https://communities.sas.com/t5/SAS-Procedures/Can-we-force-the-fitting-coefficient-be-less-than-zero/m-p/135163#M36587 <HTML><HEAD></HEAD><BODY><P>I think you can do the regression in PROC CALIS (the docs give an example) and use the BOUNDS statement to force the coefficient to be less than zero.</P></BODY></HTML> Fri, 23 Jan 2015 15:36:33 GMT https://communities.sas.com/t5/SAS-Procedures/Can-we-force-the-fitting-coefficient-be-less-than-zero/m-p/135163#M36587 PaigeMiller 2015-01-23T15:36:33Z