From Investing.com...
http://www.investing...-for-now-200032
The 2-day and 2-day drops are well within 2 standard deviations of arithmetic returns in SPY. In addition, the trendline from the bottom of November 2012 is intact and there is support around $177.32 from the lows of December of last year. Probabilities tell us to avoid averaging down but no short signal was generated. For now, there is no reason to panic as everything seems to be within normal statistical bounds.
The trendline from November 2012 is at $177.32, about $1.50 below the close of Friday, together with horizontal support from the lows of December of last year. Below that lies the 200-day simple moving average at $170.77. Something extraordinary must happen, of fundamental nature, for the market to fall below these levels in one or two sessions.
The PSI (Probability State Indicatorâ„¢) for SPY shown on the first pane took a plunge because of Friday's drop but it is still above 0.05, the hypothetical level that issues a short signal. Therefore, although probabilities favor the short side, a short signal has not been issued by this indicator yet.
The second pane shows the 1-day arithmetic returns and their statistics since SPY inception. Friday's drop of -2.13% is well within the 2 standard deviations lower band at -2.40%. This is a normal event as it can be seen from the chart. The 2-day drop of -2.94% is also well within the 2 standard deviations lower band at -3.26%, as shown on the third pane. A -3.83% 2-day event last June marked the beginning of another rally.
No reason to panic for anyone who monitors price action closely. If critical support levels are violated, then some may close long positions and wait for the market to recapture them and make them new support. Those who panic a lot are either on margin or are late bulls, usually converted from bears. Early investors and systematic traders have no reason to panic here. These are normal market conditions. if things get worse, the course of action is clear.
Disclosure: no relevant positions. Charting program: Amibroker. Disclaimer