What Is a Simple Moving Average?
The chart above shows the SPDR S&P 500 ETF (SPY) with a 10-day EMA closely following prices and a 100-day SMA grinding higher. Even with the January-February decline, the 100-day SMA held the course and did not turn down. The 50-day SMA fits somewhere between the 10- and 100-day moving averages when it comes to …