Shouldn't you be plotting OIL/USD vs RUB/USD given relative stability of USD? As well as directly studying RUB/OIL instead of introducing an extra variable? It's kind of inconsistent to first consider scaling-invariant A/B and then seek a non-scaling invariant linear relationship to better the fit.
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timeasmymeasure
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Date: 2016-01-27 09:12 pm (UTC)