Thanks for the references. The first article talks about cointegration, not correlation. They are not the same thing, so perhaps you might want to lookup the differences between the two. The second article is a 4 year old article talking about the correlation between oil and other instruments.
I'll accept that the NOK and oil are co-integrated. That makes sense and can be seen from the (long term) charts without any empirical stats required. However, I stand by my opinion that they are not correlated, or, they are only correlated very very loosely. so, if we take a 1H chart over a 5 year period, their peaks and troughs can be days, or even weeks apart.
You have to consider how you trade correlation. I'll assume you are not trading it with options as an institutional trader would do. So, how do we do it in the retail market. Well, you don't look for two instruments that are correlated and then when one moves in one direction, you buy/sell the other. That doesn't serve any purpose and you might as well just trade the original instrument. A general trading strategy with correlation is to wait for the correlation to break down, and for the pair to diverge. Then, you buy the weaker, sell the stronger, and trust that they will revert back to their correlation. You will generally have one losing trade and one winning trade, where the winner obviously outweighs the loser.
Now looking at the NOK/OIL pair, the correlation is so loose, they appear to be jumping around all over the place, all of the time. There isn't an obvious correlation, so you can't tell when the breakdown occurs. Hence it would be very difficult to know when to enter the trades.
Are you actually trading this? Did you sell USDNOK because of the rise in oil? Are you using spot forex, futures, options? What are the triggers for you? Given the almost non-existent correlation, how do you know when do you buy/sell? I am really interested in correlation trading so am curious how you are going about this in the real world.
Thanks
J