- Expect the unexpected !
- If anything can go wrong, it will !!
- Hope for the best, but prepare for the worst !!!

- Volatility increases and decreases in clusters.
- Large negative returns are accompanied by large positive returns in the cluster and vice versa.
- Most of the daily returns are confined to a +/- 5 % range.
- There are significant numbers of extraordinary returns in the data. That is, Nifty is capable of making extraordinary movements in a day's time.
- Some of these extreme movements were the result of one-off events like the general election results in 2004 and 2009.
"The range of a day's trading is simply high − low. The true range extends it to yesterday's closing price if it was outside of today's range.
Or, in plain English, true range is the largest of the
- most recent period's high less the most recent period's low
- absolute value of (the most recent period's high less the previous close) or
- absolute value of (the most recent period's low less the previous close)."
- There are more extreme data points in the TR chart than in the daily returns chart.
- There are eight TR values which are higher than 10% in the TR chart whereas there are only three similar values in the daily returns chart.
- The TR data points are significantly higher than the daily returns chart and therefore a Nifty futures trader is susceptible to significantly higher risks.
Now, how much is the margin for the Nifty futures? On an average it is around ten percent. It doesn't require much extrapolation to find that on all days the index has returned a TR of ten percent or more , at least one side of the traders would have lost their entire margins. The brokers would start their margin calls and by the time the trader either remits the margin or the broker squares off the position the losses might have become even higher. I have seen people becoming frozen or paralyzed and incapable of taking any decisions on such days. Thankfully the broker takes the decision and squares off the positions but mostly at the worst possible prices.
As we have seen the worst let us see what is the normal or 'the new normal ' values of daily returns and the true range. The following table shows the average, median and the geometric mean of both the daily returns and the true range for the sample period.
It is observed that the geometric mean of the daily returns and the average, median and geometric mean of TR are nearly identical at around 2.6 % of the previous day's closing value.
What are the key takeaways from the above statistics? They are very simple.
- Don't take big leveraged positions in the market. Even small positions can lead to extraordinary losses in trading.
- It is better to avoid market turmoil due to the expected event risks like election results, union budgets etc by keeping no positions or only positions of long options.
- Trading is a business in which any skills or advantages of a trader is used by him to build substantial profits over a period and not a wham bam game.
- Even if a trader is using all the risk control methods described in the page named Position Limits, the trader may be susceptible to significantly higher risks due to totally unanticipated events or any other reasons. Therefore, keeping a part of the trading capital as a reserve is a prudent option.
Is it mandatory to have tail piece towards the end of any discussion? Even if it is not mandatory or if it is totally unnecessary, I am having an inclination to add a tail piece. Because, there is a very apt tail piece available!
Here is a new job description. Measure the heights of 2775 people ( equal to the sample size of the trading days ) randomly and pass the collected data through the processes we used for analyzing the Nifty closing prices. We may find that the average, median and geometric mean of the new data may fall anywhere between five or six feet. This is comparable to similar values obtained by us with respect to the Nifty in the Chart 3.
However, the question is whether we will be able find people with heights of seven to nine times the average in the sample or anywhere else. But why? For example the true range is having an average of 2.63 ( Table 3) and an extreme value of 22.55 ( Table 2 ) and the ratio between them is 1: 8.5. Anyone knows that finding a human being with a height which is 8.5 times the average is an absolute impossibility. Statisticians say that the data like the heights of people is distributed normally. It simply means that most of the data points will be near the average and chances of finding a 45 feet human being is impossible.
Statisticians say that financial data series like equity prices or indices have long tails. This simply means that most of the data points when plotted on a graph will fall near the average but some of the data points will be very far away from the average and those points may look like long tails in the graph !!
That brings us back to question of whether the discussion needed a tail piece. And it is settled now !
Beware of long tails in trading !! And sometimes the tail may wag the dog as well !!!
SOURCE:: http://momentumsignal.blogspot.com








