One technical indicator suggests that the dollar has reached its most overbought level in 30 years. The z-scores of the currencies that comprise the ICE U.S. Dollar Index — the Canadian dollar, yen, British pound, Swiss franc, euro and Australian dollar — have all risen above six simultaneously for the first time since 1985. The index DXY, -0.24% is a widely watched measure of the dollar’s strength. (While there was no euro in 1985, the shared currency eventually replaced several European currencies as a constituent of the index). For those who haven’t taken an advanced statistics class, the z-score allows ... (full story)