The iShares Transportation Average ETF (IYT), known as transports, continues to lag as its all-time intraday high was set on March 1. The reversion to the mean is an investment theory that the price of a ticker, will eventually return to a longer-term simple moving average. A logical choice that's easy to track is the 200-week simple moving average. A ticker trading above its 200-week simple moving average will eventually decline back to it on weakness. Similarly, a ticker trading below its 200-week simple moving average will eventually rebound to it on strength.

Source: Forbes June 12, 2017 15:33 UTC