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.