class Object
Public Instance Methods
getChiSqrScore(countNew,totalNew,countOld,totalOld)
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# File lib/fluent/plugin/log-likelihood.rb, line 4 def getChiSqrScore (countNew,totalNew,countOld,totalOld) countNew = countNew.to_f countOld = countOld.to_f totalNew = totalNew.to_f totalOld = totalOld.to_f p = countNew/ totalNew q = countOld / totalOld if ( p < q ) return 0 end t = (countNew + countOld) / (totalOld + totalNew) if ( t == 0) return nil end v = countNew * Math::log(p/t) + countOld * Math::log(q/t) if ( t == 1 ) return Statistics2..chi2X_(1,2*v) end if ( p < 1) v = v + ((totalNew - countNew) * Math::log((1-p)/(1-t))) end if ( q < 1) v = v + ((totalOld - countOld) * Math::log((1-q)/(1-t))) end return Statistics2.chi2X_(1,2*v) end