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!
