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Why normalize only data for CDSs for PCA?

I'm reading a Credit Suisse Research Report on PCA. The report says that to preprocess the data, you should "Centre data (and normalize when considering CDS data)." Why would you only normalize ...
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How to get positions of your portfolio from Interactive Brokers with python ibPy?

I am using ibpy to get the positions of my portfolio. I understand that I can do: ...