A visit to the DecisionPoint Chart Gallery will show you that on the S&P 500, the Intermediate-Term Trend Model moved to a Neutral signal. This happens when the 20-EMA crosses below the 50-EMA while the 50-EMA is above the 200-EMA. It would be a SELL signal if the 50-EMA were below the 200-EMA because that implies a bear market bias.
The purpose of the