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From John Smith <localde...@gmail.com>
Subject Re: statistics in hitlist
Date Fri, 23 Feb 2018 20:10:45 GMT
Hi Joel, thanks for the answer. I'm not really a stats guy, but the end
result of all this is supposed to be obtaining R^2. Is there no way of
obtaining this value, then (short of iterating over all the results in the
hitlist and calculating it myself)?

On Fri, Feb 23, 2018 at 12:26 PM, Joel Bernstein <joelsolr@gmail.com> wrote:

> Typically SSE is the sum of the squared errors of the prediction in a
> regression analysis. The stats component doesn't perform regression,
> although it might be a nice feature.
>
>
>
> Joel Bernstein
> http://joelsolr.blogspot.com/
>
> On Fri, Feb 23, 2018 at 12:17 PM, John Smith <localdevjs@gmail.com> wrote:
>
> > I'm using solr, and enabling stats as per this page:
> > https://lucene.apache.org/solr/guide/6_6/the-stats-component.html
> >
> > I want to get more stat values though. Specifically I'm looking for
> > r-squared (coefficient of determination). This value is not present in
> > solr, however some of the pieces used to calculate r^2 are in the stats
> > element, for example:
> >
> > <double name="min">0.0</double>
> > <double name="max">10.0</double>
> > <long name="count">15</long>
> > <long name="missing">17</long>
> > <double name="sum">85.0</double>
> > <double name="sumOfSquares">603.0</double>
> > <double name="mean">5.666666666666667</double>
> > <double name="stddev">2.943920288775949</double>
> >
> >
> > So I have the sumOfSquares available (SST), and using this calculation, I
> > can get R^2:
> >
> > R^2 = 1 - SSE/SST
> >
> > All I need then is SSE. Is there anyway I can get SSE from those other
> > stats in solr?
> >
> > Thanks in advance!
> >
>

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