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## Oops! PCA plotting

**From**: |
Gerrit J. Kiers |

**Subject**: |
Oops! PCA plotting |

**Date**: |
Fri, 4 May 2001 09:28:18 +0200 |

I made a big mistake in my previous posting (Plotting a PCA with contours)
I presumed one could use
>* normal_pdf(*somethingtodowitheigenvalue*,Mean_t(1,1),Var_t(1,1) )*
for calculating the probability along the two principal axis of the
ellipse, but obviously Mean_t(1,1),Var_t(1,1) are derived from the data
columns in data-matrix t and have nothing to do with the PCA calculation.
Gerrit
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