what n and p denotes in n*p input matrix of pca?
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parul mittal
el 27 de Nov. de 2016
Editada: parul mittal
el 28 de Nov. de 2016
I m bit confused matrix which is to be fed as input to princomp should be in the form of 160*25 or 25*160 where 25 are coffecients and 160 are features. as when I give input as 25*160 it is generating coefficient matrix and with 160*25 generating error Eigen value<0. Kindly help me.
thanx
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Walter Roberson
el 27 de Nov. de 2016
"Rows of X correspond to observations, columns to variables"
Features would correspond to variables, but it is not obvious what you mean by "coefficients".
I would expect there to be problems if you implicitly told it there were more variables than there were observations, by using an array that was taller than it was wide, so I would expect that you need to pass in the 25 x 160 matrix.
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