In trading, correlation is a measurement of the relationship between two assets.
A positive correlation suggests that Security B will move in the same direction as Security A.
For example, the German stock market (DAX) and EUR/JPY moved in the same direction from 2004 to 2010. That is, EUR/JPY rose when DAX performed well and plummeted when the stock market dropped.
A negative correlation suggests that Security B will move in the opposite direction of Security A.
An example is a correlation between EUR/USD and the dollar index (USDX). A strong dollar would usually lift USDX, but it will also boost the dollar against the euro, resulting in downward price action for EUR/USD.
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