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To: equismetastock[at]yahoogroups.com Date: Saturday, April 2, 2005, 8:56:03 PM Subject: [EquisMetaStock Group] Ulcer Index I have heard of the ulcer index. As I understand it, the problem with Beta is that it measures volatility to both the upside and downside. We do not mind volatility to the upside. Is this what the ulcer index is and how is it coded? Christie =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= From: deepfoobar To: equismetastock[at]yahoogroups.com Date: Sunday, April 3, 2005, 3:30:59 AM Subject: [EquisMetaStock Group] Re: Ulcer Index I had this laying around but in truth have never used it. Ulcer Index Period:=10; {set this to the number of periods to calculate in the formula} Sqrt(Sum(Power(100*( HHV(CLOSE,Period) - CLOSE ) / (HHV(CLOSE,Period)),2),Period)/Period) There is a description here of what it is meant to do. http://www.investopedia.com/articles/technical/03/030403.asp Quotation (from this site): Developed by Peter G. Martin and Byron B. McCann and described in detail in their book, "The Investor's Guide To Fidelity Funds" (1989), the ulcer index is a very effective risk indicator. Risk means many things to many people but it is inherent to investing. Peter Martin and Byron McCann, once stated, "the higher an investment's ulcer index, the more likely investing in it will cause ulcers or sleepless nights." Here's what Gary Elsner, Ph.D., the editor of the mutual-fund timing newsletter Achieve Profits writes: "The standard deviation is a good measure of volatility, since it measures the amount of variation around the average and is probably the most widely used measure of financial risk. But the standard deviation has two weaknesses for financial instruments. First, it measures the variation from the average in both the up (good) direction as well as the down (bad) direction. Second, the standard deviation does not distinguish between short or long sequences of losses. Investors are only concerned about downside risk (or the potential for losses), whereas upside changes or rapid increases in value create profits. In contrast to the standard deviation, the ulcer index has none of the aforementioned weaknesses since it calculates retracement, the tendency for values to fall from previous highs, by measuring the depth of the drop and the time that it takes the performance measure to recover to the original level." =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= From: christie1969us To: equismetastock[at]yahoogroups.com Date: Sunday, April 3, 2005, 7:06:23 AM Subject: [EquisMetaStock Group] Re: Ulcer Index This is interesting. From reading the article there seems to be a time element as well. A security being low for 2 days would have a higher ulcer index than just 1 day. Christie =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= From: MG Ferreira To: equismetastock[at]yahoogroups.com Date: Monday, April 4, 2005, 8:02:26 AM Subject: [EquisMetaStock Group] Re: Ulcer Index Hi Christie, There is a very popular model called the GARCH model. It is used to estimate volatility and has shown great potential, even in trading models, and is used a lot nowadays (it was developed in the 80s). You also get many flavours of 'asymmetric' GARCH models, which you may be interested in. If you fit a good asymmetric GARCH model to a ticker, you can use the model to construct the NIC or news impact curve. This measures, for a piece of 'good' and a similar piece of 'bad' news, the impact it will have on volatility. So you can see how much volatility will increase due to a shock on the downside vs a similar shock on the upside. Have a look at http://www.ferra4models.com/Shop.html (which is still under construction) where there are a few NICs to get an idea of what it does. This from an article published in Risk magazine some time ago, if you have access to it, I'll give you the details to get it. This is a very useful device and used by option traders and risk managers, but also quite complex. If it is what you are looking for, just read up a bit on it and feel free to ask! Regards MG Ferreira TsaTsa EOD Programmer and trading model builder http://www.ferra4models.com http://fun.ferra4models.com Code:
 all formulas for MetaStockall formulas
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| However we try to maintain hiqhest possible level of service - most formulas, oscillators, indicators and systems are submitted by anonymous users. Therefore S4T™ does not take any responsibility for it's quality. If you use any of this information, use it at your own risk. You are responsible for your own trading decisions. Be sure to verify that any information you see on these pages is correct, and is applicable to your particular trade. In no case will S4T™ be responsible for your trading gains or losses. |
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