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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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