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Re: Linear regression notebook won't work in Version 9

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  • Subject: [mg129214] Re: Linear regression notebook won't work in Version 9
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Fri, 21 Dec 2012 05:41:24 -0500 (EST)
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My guess would be that you had assigned a value to x in your v9
session. Make sure that it has been cleared.

$Version

9.0 for Mac OS X x86 (64-bit) (November 20, 2012)

Clear[x]

linearregressionY={{-16.4438,-180.545},{-20.4477,-182.192},{-20.283,-182.437},{-20.2559,-182.424},{-19.1476,-182.498},{-20.0728,-181.393},{-20.1681,-181.986}};

lm=LinearModelFit[linearregressionY,x,x]

FittedModel[-174.329+0.38862 x]


Bob Hanlon


On Thu, Dec 20, 2012 at 3:19 AM, UMass74 <fhasmith at frankandluann.net> wrote:
> Hi:
>
> I'm a relative newbie to Mathematica.
>
> I wrote a notebook that did linear regression on some data. It worked fine in Version 8.
>
> Here are two lines from the Version 8 notebook which works. I still have Version 8 on my laptop. The data is named linearregressionY
>
> linearregressionY//TableForm (* Prints out data table used in regression*)
>
> {{-16.4438,-180.545},{-20.4477,-182.192},{-20.283,-182.437},{-20.2559,-182.424},{-19.1476,-182.498},{-20.0728,-181.393},{-20.1681,-181.986}}
>
>
> lm=LinearModelFit[linearregressionY,x,x] (* Mathematica computes linear regression model *)
>
> Version 8 computes the model and everything works fine in the rest of the notebook.
>
> However, Version 9 on my desktop chokes with the following error message
>
>
> LinearModelFit::ivar: {7.315,8.239} is not a valid variable. >>
>
> Anyone have an idea what's going on? Nothing changed except for upgrading to Version 9...
>



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