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From: Rahul on 20 Feb 2010 14:07
Dear All,

Can someone help me with the following output while building a mode
using logistic regression:

Association of Predicted Probabilities and Observed Responses
Percent Concordant 66.5 Somers' D 0.335
Percent Discordant 32.9 Gamma 0.337
Percent Tied 0.6 Tau-a 0.115
Pairs 497522982 c 0.668

I want to understand the concept, and use of this statistic and how is
this calculated?

Regards.
From: Sierra Information Services on 20 Feb 2010 21:22
These statistics are usually discussed/explained in an introductory
course on logistic regression / predictive modeling.

Andrew Karp
Sierra Information Services
http://www.SierraInformation.com


On Feb 20, 11:07�am, Rahul <rmitt...(a)gmail.com> wrote:
> Dear All,
>
> Can someone help me with the following output while building a mode
> using logistic regression:
>
> Association of Predicted Probabilities and Observed Responses
> Percent Concordant 66.5 Somers' D 0.335
> Percent Discordant 32.9 Gamma 0.337
> Percent Tied 0.6 Tau-a 0.115
> Pairs 497522982 c 0.668
>
> I want to understand the concept, and use of this statistic and how is
> this calculated?
>
> Regards.

From: Rahul on 21 Feb 2010 04:43
On Feb 21, 7:22 am, Sierra Information Services <sfbay0...(a)aol.com>
wrote:
> These statistics are usually discussed/explained in an introductory
> course onlogisticregression/ predictive modeling.
>
> Andrew Karp
> Sierra Information Serviceshttp://www.SierraInformation.com
>
> On Feb 20, 11:07 am, Rahul <rmitt...(a)gmail.com> wrote:
>
>
>
> > Dear All,
>
> > Can someone help me with the following output while building a mode
> > usinglogisticregression:
>
> > Association of Predicted Probabilities and Observed Responses
> > Percent Concordant 66.5 Somers' D 0.335
> > Percent Discordant 32.9 Gamma 0.337
> > Percent Tied 0.6 Tau-a 0.115
> > Pairs 497522982 c 0.668
>
> > I want to understand the concept, and use of this statistic and how is
> > this calculated?
>
> > Regards.- Hide quoted text -
>
> - Show quoted text -

Hi Andrew,

Could you please point me a relevant link on internet where I can read
and understand these concepts both conceptually and mathematically.

Regards.
From: Sierra Information Services on 21 Feb 2010 21:24
I think a "relevant link" to these concepts will be found when you
register/pay for, and then attend, a class on logistic regression.

On Feb 21, 1:43�am, Rahul <rmitt...(a)gmail.com> wrote:
> On Feb 21, 7:22�am, Sierra Information Services <sfbay0...(a)aol.com>
> wrote:
>
>
>
>
>
> > These statistics are usually discussed/explained in an introductory
> > course onlogisticregression/ predictive modeling.
>
> > Andrew Karp
> > Sierra Information Serviceshttp://www.SierraInformation.com
>
> > On Feb 20, 11:07 am, Rahul <rmitt...(a)gmail.com> wrote:
>
> > > Dear All,
>
> > > Can someone help me with the following output while building a mode
> > > usinglogisticregression:
>
> > > Association of Predicted Probabilities and Observed Responses
> > > Percent Concordant 66.5 Somers' D 0.335
> > > Percent Discordant 32.9 Gamma 0.337
> > > Percent Tied 0.6 Tau-a 0.115
> > > Pairs 497522982 c 0.668
>
> > > I want to understand the concept, and use of this statistic and how is
> > > this calculated?
>
> > > Regards.- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Andrew,
>
> Could you please point me a relevant link on internet where I can read
> and understand these concepts both conceptually and mathematically.
>
> Regards.- Hide quoted text -
>
> - Show quoted text -

From: NordlDJ on 22 Feb 2010 13:47
> -----Original Message-----
> From: SAS(r) Discussion [mailto:SAS-L(a)LISTSERV.UGA.EDU] On Behalf Of
> Rahul
> Sent: Sunday, February 21, 2010 1:44 AM
> To: SAS-L(a)LISTSERV.UGA.EDU
> Subject: Re: Concordance logistic regression SAS
>
> On Feb 21, 7:22 am, Sierra Information Services <sfbay0...(a)aol.com>
> wrote:
> > These statistics are usually discussed/explained in an introductory
> > course onlogisticregression/ predictive modeling.
> >
> > Andrew Karp
> > Sierra Information Serviceshttp://www.SierraInformation.com
> >
> > On Feb 20, 11:07 am, Rahul <rmitt...(a)gmail.com> wrote:
> >
> >
> >
> > > Dear All,
> >
> > > Can someone help me with the following output while building a mode
> > > usinglogisticregression:
> >
> > > Association of Predicted Probabilities and Observed Responses
> > > Percent Concordant 66.5 Somers' D 0.335
> > > Percent Discordant 32.9 Gamma 0.337
> > > Percent Tied 0.6 Tau-a 0.115
> > > Pairs 497522982 c 0.668
> >
> > > I want to understand the concept, and use of this statistic and how is
> > > this calculated?
> >
> > > Regards.- Hide quoted text -
> >
> > - Show quoted text -
>
> Hi Andrew,
>
> Could you please point me a relevant link on internet where I can read
> and understand these concepts both conceptually and mathematically.
>
> Regards.

Here is one explanation from SAS-L. You can find others if you search the wonderful SAS-L archives.

http://listserv.uga.edu/cgi-bin/wa?A2=ind0604D&L=sas-l&P=R63674

Hope this is helpful,

Dan

Daniel J. Nordlund
Washington State Department of Social and Health Services
Planning, Performance, and Accountability
Research and Data Analysis Division
Olympia, WA 98504-5204
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