These four charts help explain this week's action in markets. The S&P 500 experienced its worst weekly decline since early September, when the index dropped 4.3% following a weaker-than-expected ...

Market observers are keenly eyeing bullish divergences on RSI, which on weekly time frames is abandoning a downtrend in place ...

In the past week, the S&P 500 (^GSPC) either increased or fell by 1% every day — generally the latter ... off more than 10% from its most recent high. As our chart of the week shows, the ...