[OTDev] r-square computation in validation changed
Pantelis Sopasakis chvng at mail.ntua.grWed Jul 13 11:59:07 CEST 2011
- Previous message: [OTDev] Service and Application development within OpenTox
- Next message: [OTDev] r-square computation in validation changed
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Hi Martin, All, There are some other formulas that you can find here and there but to the best of my knowledge they're all equivalent. In all cases R-squared should be non-negative (read the attached file). Best regards, Pantelis On Wed, 2011-07-13 at 10:50 +0200, Martin Guetlein wrote: > Hey Pantelis, > > we are having a internal discussion which r-square computation is the > right one. Do you have a opinion on that? > > Regards, > Martin > > > On Tue, May 24, 2011 at 10:12 AM, Martin Guetlein > <martin.guetlein at googlemail.com> wrote: > Hello All, > > I just changed the r-square computation within the validation > service. So far I used the squared sample correlation > coefficient. However, it seems that the more common way to > compute r-square is 1 - SSE/SST (thats how it is computed in R > as well). > I updated the validation statistics page > (http://opentox.org/data/documents/development/validation/validation-statistics) accordingly. > > Best regards, > Martin > > > P.S. some links > r-square definitions: > http://web.maths.unsw.edu.au/~adelle/Garvan/Assays/GoodnessOfFit.html > http://en.wikipedia.org/wiki/Coefficient_of_determination#Definitions > r-square as squared sample correlation coefficient > http://mathworld.wolfram.com/CorrelationCoefficient.html > > > -- > Dipl-Inf. Martin Gütlein > Phone: > +49 (0)761 203 8442 (office) > +49 (0)177 623 9499 (mobile) > Email: > guetlein at informatik.uni-freiburg.de > > > > -- > Dipl-Inf. Martin Gütlein > Phone: > +49 (0)761 203 7633 (office) > +49 (0)177 623 9499 (mobile) > Email: > guetlein at informatik.uni-freiburg.de -------------- next part -------------- A non-text attachment was scrubbed... Name: R2isPositive.pdf Type: application/pdf Size: 124693 bytes Desc: not available URL: <http://lists.opentox.org/pipermail/development/attachments/20110713/194ff571/attachment.pdf>
- Previous message: [OTDev] Service and Application development within OpenTox
- Next message: [OTDev] r-square computation in validation changed
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
More information about the Development mailing list