Re: Question about DurbinWatsonD
- To: mathgroup at smc.vnet.net
- Subject: [mg119089] Re: Question about DurbinWatsonD
- From: Peter Pein <petsie at dordos.net>
- Date: Sat, 21 May 2011 06:49:54 -0400 (EDT)
- References: <ir5g8t$t1m$1@smc.vnet.net>
Am 20.05.2011 12:37, schrieb Gilmar Rodriguez-pierluissi: > In: > > http://reference.wolfram.com/mathematica/RegressionCommon/ref/DurbinWatsonD.html > > it says that: > > "As of Version 7.0, DurbinWatsonD has become a property of LinearModelFit". > > But, when I evaluate: > > data = {{0.05, 90}, {0.09, 95}, {0.14, 110}, {0.17, 125}, {0.2, 140}, {0.21, 150}, {0.23, 175}, {0.25, 190}, {0.3, 210}, {0.35, 255}}; > > LinearModelFit[data, {1, x^2}, x, RegressionReport -> {DurbinWatsonD}] > > the above line will not produce the DurbinWatsonD value of 1.14 shown in the example on that web page. > > How can I then get the DurbinWatsonD value? > > Thank you! > > Gilmar Rodriguez Pierluissi > Hi, The option RegressionReport appears red in my Version (8.01) of Mathematica. Are you sure you didn't want *Non*LinearModelFit (as x^2 is'nt linear at all)?? In[1]:= data={{0.05,90},{0.09,95},{0.14,110},{0.17,125},{0.2,140},{0.21,150},{0.23,175},{0.25,190},{0.3,210},{0.35,255}}; NonLinearModelFit[data,{1,x^2},x,RegressionReport->{DurbinWatsonD}] Out[2]= NonLinearModelFit[{{0.05,90},{0.09,95},{0.14,110},{0.17,125},{0.2,140},{0.21,150},{0.23,175},{0.25,190},{0.3,210},{0.35,255}},{1,x^2},x,RegressionReport->{DurbinWatsonD}]