Talk:Multivariate normal distribution

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Wrong PDF for Bivariate case

I think the second formula for the pdf of the bivariate case is wrong since it does not generate the same cross term than the formula above (there is a factor \rho) missing.

128.103.224.4 (talk) 21:46, 24 July 2015 (UTC)

truly terrible TeX code

I found the following code:

y\left( x \right) = {\mathop{\rm sgn}} \left( {{\rho }} \right)\frac{{{\sigma _y}}}{{{\sigma _x}}}\left( {x - {\mu _x}} \right) + {\mu _y}.

I changed it to this:

y(x) = \mathop{\rm sgn} (\rho)\frac{\sigma_Y}{\sigma_X} (x - \mu_X) + \mu_Y.

Quite aside from the incorrectly lower-case subscripts, can a worse way of writing TeX code be imagined, short of actual malice? Michael Hardy (talk) 20:14, 28 June 2015 (UTC)

Wrong PDF in the summary box

It states e^{1/(2 pi) .......}, while it should be just e^{-1/2 ......} — Preceding unsigned comment added by 2001:67C:10EC:52C7:8000:0:0:6F (talk) 09:17, 26 September 2016 (UTC)