Github user tgaloppo commented on the pull request:
https://github.com/apache/spark/pull/4459#issuecomment-73568637
@MechCoder Do you mean the negative values in the covariance (sigma)
matrices? Negative covariance indicates, roughly speaking, that variables move
in opposite directions... as one increases, the other decreases (positive
covariance indicate they move together, and zero covariance indicate they move
independently). The covariance matrix has the variance of the individual
vector components on the diagonal, and the covariance between vector components
off the diagonal (and is symmetric). Does this help??
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