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Re: Regressions in Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg91961] Re: Regressions in Mathematica
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Mon, 15 Sep 2008 03:40:44 -0400 (EDT)

On 9/13/08 at 5:54 AM, gregory.lypny at videotron.ca (Gregory Lypny)
wrote:

>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.

The syntax is

Regress[data, basisFunctionList, independentVariableList]

So with two independent variables you would do:

Regress[data, {1, x, y^2}, {x, y}]

where I am fitting the model a + b x + c y^2 to the data.

The list of variables in the third argument needs to list them
in order they appear in data.


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