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


Several people suggested clearing the variable, which was indeed my problem.

Thanks to all who took the time to contact me.

Regards

On Thursday, December 20, 2012 3:19:08 AM UTC-5, UMass74 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
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> 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}}
> 
> 
> 
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> lm=LinearModelFit[linearregressionY,x,x] (* Mathematica computes linear regression model *)
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> Version 8 computes the model and everything works fine in the rest of the notebook.
> 
> 
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> However, Version 9 on my desktop chokes with the following error message
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> 
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> 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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