The Gaussian distribution
Examining these equations, we can see that the multivariate density coincides with the univariate density in the special case when 2is the scalar ˙. Again, the vector speci˙es the mean of the multivariate Gaussian distribution. The matrix speci˙es the covariance between each pair of variables in x: = cov(x;x) = E (x )(x )>:
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