Lines Matching refs:variance
40 // and the variance is 0
57 double AbsSeq::variance() const {
64 // due to loss-of-precision errors, the variance might be negative
68 // "if variance is negative, it should be very small");
75 double var = variance();
76 guarantee( var >= 0.0, "variance should not be negative" );
90 // due to loss-of-precision errors, the variance might be negative
94 "if variance is negative, it should be very small");
102 guarantee( var >= 0.0, "variance should not be negative" );
166 guarantee( variance() > -1.0, "variance should be >= 0" );