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I'd like to apply principal component analysis (PCA) to hyperspectral data (~1000 bands). The number of observations is 200.

The estimated variance covarance matrix is singular because the number of observations is smaller than the number of variables.

My questions are,

Can I still perform PCA (number of variables is < number of observations)?

Is the maximum number of meaninful principal components equal to 199?

Could you also provide me with references, please?

Thanks a lot in advance.

MiguelCC

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# Principal component analysis (PCA) with small number of observations

Can you offer guidance or do you also need help?

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