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I've read the above but have to wonder about how useful the method is and weather the data really provides helpful information.

Ok one end date provides a "sell everything now" price but any conclusions about how your doing can easily be evaporated as prices move around. A currency move (or whatever) one day later would make the results completely different even if the underlying investments were the same.
Maybe this method is only realistic for holdings that have been sold and with existing holdings we really don't know until its all over.

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