SD Stops A Standard Deviation Based Stop Loss Calculator The standard deviation is the statistical tool used by statisticians to measure volatility (risk). SD Stops uses the standard deviation to determine statistically valid stoploss levels. It computes stop losses for both long and short positions. When implemented as trailing stop losses, such stops can help prevent the unnecessary loss of gain due to a stock's advance. The standard deviation is the best and most statistically valid measurement of stock volatility available. By taking a sample of 20 days, a standard deviation can be computed that gives a relatively accurate estimate of price excursion beyond the limits of the data sampled. For example, a standard deviation can be used to estimate the full range of heights of 10,000 men in an arena by taking a random sample of 100 of those men (assuming the 10,000 men in the arena are randomly distributed by height and that the 100 men are selected randomly). The standard deviation can even give a relatively accurate estimate of how many men in the arena are 6'8" even if there are no men of that height among the 100 men measured. Fairly accurate estimates can be made because the frequency of occurrence of various heights in a population follow what is known as a Gaussian distribution or normal bellshaped curve. The same is true of IQs, the weights of people, muscular strength, and so on. It is also the best way we have of estimating the probable range of price surges of a stock. Price surges represent volatility (risk). For a discussion of this, see Stop Loss Probabilities You must be able to open and use an Excel 2007 spreadsheet with macros (.xlsm files) on your computer to be able to use SD Stops. To test your system, click on the following link. It will take you to a page where you can download a small Excel spreadsheet with a macro (SD Stops has a few macros). If you can enter a number and cause the spreadsheet to recalculate, and if your system can pass the macro test provided, then you should have no trouble using SD Stops on your system. Go to the test page. The Cost The use of SD Stops for a year costs much less than the price of a subscription to the av Ordering and The License Agreement Read the License Agreement for details before ordering. To read the License Agreement, click on Agreement. An order cannot be transmitted to us unless you acknowledge that you have read the License Agreement. Prsummary and opportunity to order. eviously, we d id not offer a trial period because we could not turn the tool off remotely once we sent it to a user. We believe we have solved that problem. We can now program the tool to automatically shut down if new codes are not entered after a trial period. See the License Agreement (ab ove link) for details about the trial period. If you are interested, click on Click on the following link to learn about our other stop loss calculator. Stops
For more information on standard deviation and its meaning and use in stop loss calculations go to http://www.stockdisciplines.com/stoplossprobabilities
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