Quote from kinggyppo:
article about stop placement. There is no magic answer, some traders have good luck with volatility stops. I got stopped out this morning two ticks from the market reversal higher. That is how it goes in trading sometimes.
http://bestsmallcapstock.com/win-more-with-better-stop-placement
http://www.tradingmarkets.com/.site/stocks/education/StopLoss/