Assets with high correlation move in the same direction. For this reason, opening multiple positions with pairs that are highly correlated is not advisable, as you are essentially making the same trade more than once. This puts you in a very vulnerable position if the market turns against you. In Forex, if a trader goes long on the AUDCHF, AUDJPY, and EURJPY, a trader risks double exposure if they are highly correlated.
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There are many different ways that you can use currency strength meters in your trading. All of them depend on your trading style.
What might also happen is that one of the pairs indicates a strong movement, while the other is just ranging, which signals traders to avoid entering trades with correlated pairs in the opposite direction. For example, if the EUR/USD is witnessing a downtrend, and the GBP/USD is ranging, a trader should avoid going long on GBP/USD, which carries a higher downside risk due to possible USD strength.
The basic idea of the strengthmeter is to view it as a "filter", which allows you to make better decisions. It lets us know, for instance, whether the US dollars is strengthening or decreasing. This is always important.
If the correlation strength between different pairs is known in advance, a trader can avoid unnecessary hedging. For example, if there is a negative correlation between EUR/USD and USD/CHF, you know that these pairs are moving in different directions. Therefore, if you opened long trades on both, you would likely win on one trade and lose on the other.
Depending upon your Forex trading style, there may be other time frames that you need. More recent data is required if you trade intraday. Monthly data is required for long-term traders.
Digging deeper, the aforementioned positions bring double exposure to AUD and JPY, which can be harmful for trade should the movement go in the opposite direction from the trader's expectations.
As an extra confirmation, professionals recommend that you use a forex strength measure.
With a Forex correlation matrix, you can see at a glance which currencies are correlated, which means you can avoid making these trades in the first place, and can consequently avoid double exposure to a weak currency.
A second thing to keep in mind is that the timeframes within which you place a currency are determinants of its strength. EUR can be stable for today, but it is weak in monthly analysis.
Correlation between different currency pairs can also signal the level of trade strategy risk. For example, if we are going long on EUR/USD and GBPUSD, and both are positively correlated pairs, it signals a possible double risk from the same position if one of the currencies is strong.
If you trade in the direction of the trend, the strongest trend is the one that is based on the weakest and strongest currency. You can trade in a range by choosing currencies that are slightly stronger than others.