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Linear regression notebook won't work in Version 9


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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