Volatility Signals a Small Trading Range Ahead
Stocks entered last week oversold and continued to sell off on Monday and Tuesday morning. After rallying 2.2% from Tuesday's low, SPDR S&P 500 (NYSE: SPY) ended the week with a gain of 0.14%, reversing a loss of the exact same amount the week before. SPY has now closed at exactly $152.11 in two of the last three weeks. With small moves of 0.14% for two straight weeks, February ended as one of the least volatile months in stock market history.
The CBOE Volatility Index (VIX) is widely used to measure volatility and VIX is significantly below its long-term average values. The chart below, compressed to show the entire trading history of SPY, uses a different volatility indicator, the monthly average true range (ATR). ATR measures the distance from high to low (accounting for gaps) in a time period. The chart shows the value of the ATR divided by the closing price, expressing the trading range as a percent of the current price. This calculation makes indicator values comparable over time. Last month, this indicator fell to 3%.
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