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References to 'covariance'
1. conditional distribution of multi-variate normal variable by stevecheng
2. joint normal distribution by gel
3. least squares by akrowne
4. one-pass algorithm to compute sample variance by stevecheng
5. opus number by PrimeFan
6. quantum super-operators by bci1
7. spin groups by bci1
8. sums of normal random variables need not be normal by gel
9. two-dimensional Fourier transforms by bci1
10. variance by stevecheng