When the Dollar Index is compared to the Eur/Usd, the correlation is obvious, a converse relationship. One goes up as the other goes down. The Euro makes up over 60% of the Dollar Index and as such traders really need to check the Euro for direction on a regular basis.

美元欧元近三年的走势图对比

在美指中：EUR占58%，YPY13%，GBP12%，