Linear regression notebook won't work in Version 9
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- Subject: [mg129180] Linear regression notebook won't work in Version 9
- From: UMass74 <fhasmith at frankandluann.net>
- Date: Thu, 20 Dec 2012 03:19:38 -0500 (EST)
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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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- Re: Linear regression notebook won't work in Version 9