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| Started by | Gilmar Rodriguez-pierluissi <peacenova@yahoo.com> |
|---|---|
| First post | 2011-05-20 10:37 +0000 |
| Last post | 2011-05-21 10:49 +0000 |
| Articles | 3 — 3 participants |
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Question about DurbinWatsonD Gilmar Rodriguez-pierluissi <peacenova@yahoo.com> - 2011-05-20 10:37 +0000
Re: Question about DurbinWatsonD richard i pelletier <bitbucket@comcast.net> - 2011-05-21 10:46 +0000
Re: Question about DurbinWatsonD Peter Pein <petsie@dordos.net> - 2011-05-21 10:49 +0000
| From | Gilmar Rodriguez-pierluissi <peacenova@yahoo.com> |
|---|---|
| Date | 2011-05-20 10:37 +0000 |
| Subject | Question about DurbinWatsonD |
| Message-ID | <ir5g8t$t1m$1@smc.vnet.net> |
In:
http://reference.wolfram.com/mathematica/RegressionCommon/ref/DurbinWatsonD.html
it says that:
"As of Version 7.0, DurbinWatsonD has become a property of LinearModelFit".
But, when I evaluate:
data = {{0.05, 90}, {0.09, 95}, {0.14, 110}, {0.17, 125}, {0.2, 140}, {0.21, 150}, {0.23, 175}, {0.25, 190}, {0.3, 210}, {0.35, 255}};
LinearModelFit[data, {1, x^2}, x, RegressionReport -> {DurbinWatsonD}]
the above line will not produce the DurbinWatsonD value of 1.14 shown in the example on that web page.
How can I then get the DurbinWatsonD value?
Thank you!
Gilmar Rodriguez Pierluissi
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| From | richard i pelletier <bitbucket@comcast.net> |
|---|---|
| Date | 2011-05-21 10:46 +0000 |
| Message-ID | <ir856q$bdj$1@smc.vnet.net> |
| In reply to | #2507 |
In article <ir5g8t$t1m$1@smc.vnet.net>,
Gilmar Rodriguez-pierluissi <peacenova@yahoo.com> wrote:
> when I evaluate:
>
> data = {{0.05, 90}, {0.09, 95}, {0.14, 110}, {0.17, 125}, {0.2, 140}, {0.21,
> 150}, {0.23, 175}, {0.25, 190}, {0.3, 210}, {0.35, 255}};
>
> LinearModelFit[data, {1, x^2}, x, RegressionReport -> {DurbinWatsonD}]
>
> the above line will not produce the DurbinWatsonD value of 1.14 shown in the
> example on that web page.
The correct syntax for LinearModelFit is
LinearModelFit[data,{1,x^2},x]["DurbinWatsonD"]
Vale,
rip
--
email address is r i p 1 AT c o m c a s t DOT n e t
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| From | Peter Pein <petsie@dordos.net> |
|---|---|
| Date | 2011-05-21 10:49 +0000 |
| Message-ID | <ir85c3$bhu$1@smc.vnet.net> |
| In reply to | #2507 |
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}]
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