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Re: Regressions in Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92010] Re: Regressions in Mathematica
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 16 Sep 2008 19:27:10 -0400 (EDT)
  • References: <gag2m5$3a8$1@smc.vnet.net>

Hi,

Needs["LinearRegression`"]

tdata = Append[#, Times @@ #] & /@ Table[RandomReal[], {10}, {2}];

Regress[tdata, {1, x, y, x*y}, {x, y}]

??

Regards
   Jens


Gregory Lypny wrote:
> Hello everyone,
> 
> I'm having trouble understanding the syntax of the Regress command.   
> If data is an nx2 matrix where the first column is the explanatory  
> variable and the second is the dependent variable,  then either
> 
> 	Regress[data, {1, x}, x]
> 
> or
> 
> 	Regress[data, x, x]
> 
> performs a standard regression of the second column on the first with  
> a constant thrown in.  But how do I write the command for the case of  
> more than one explanatory variable?  Say that my data matrix is now  
> nx3, so that the first two columns are the explanatory variables and  
> the last is the dependent variable.
> 
> Regress[data, {x,x}, x] or Regress[data, {1, x,x}, x] gives the error  
> message "Number of coordinates (2) is not equal to the number of  
> variables (1)".  I'm not sure how I'm supposed to identify each  
> explanatory variable.
> 
> Regards,
> 
> 	Gregory
> 


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