I am afraid this might be a stupid question, but after scanning a little bit through the help archive and the internet, I didn't come up with an answer myself.
I have done a principle component analysis on a data set, which yields the mean response of 14 olfactory neurons to 16 different odors. When plotting the result in a biplot, it nicely shows me the odors in different positions in the principle component space. Additionally, the neurons are shown as vectors within this plot. My question now is: what are the units of the axes? When doing the principle component in IDL, the relative positions of the odors are the same, but units on the axes span a much wider range. Additionally I couldn't figure out what the units in the variable space (right and upper border in the biplot) do represent.
I really hope somebody can helpme with this,
Mathias Ditzen
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