My trading of stocks is hinge on only 2 criteria. (1) The market trend; (2) the technical of the stock trading.
Lets take a look at BillinCSprings suggestion of investing in ESRX.
The stock is in a strong up tend above the 200 MA but, its MACD and STO are showing it in a down trend. Risk is increasing as its MACD moves toward null. I would wait until the MACD and STO cross into positive area. Risk is greater to the downside today because the markets overseas are reported to be in downtrends for the day.