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

*To*: mathgroup at smc.vnet.net*Subject*: [mg129206] Re: Linear regression notebook won't work in Version 9*From*: UMass74 <fhasmith at frankandluann.net>*Date*: Fri, 21 Dec 2012 05:38:14 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <kauhls$iq4$1@smc.vnet.net>

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 > > > > 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...