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The '''range expansion index''' ('''REI''') is a [[technical indicator]] used in the [[technical analysis]] of [[financial market]]s. It is intended to chart the relative strength or weakness of a trading vehicle based on the comparison of the recent price changes and the overall price changes for the period.


The REI can be classified as a momentum [[Oscillator (technical analysis)|oscillator]], measuring the velocity and magnitude of directional price movements. The REI shows overbought/oversold price conditions by measuring the relation between the sum of "strong" price changes (such that form a trend) and all price changes for the period.


The REI is most typically used on a 8 day timeframe. It changes on a scale from −100 to +100, with the overbought and oversold levels marked at +60 and −60, respectively.
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The range expansion index was developed by [[Thomas DeMark]] and published in his 1994 book, ''The New Science of Technical Analysis''.<ref>Thomas R. DeMark, ''The New Science of Technical Analysis'', ISBN 0-471-03548-3</ref>
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==Calculation==
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Two sums are calculated for each day. One is the conditional sum of the "strong" price changes:


: <math> S1 = \sum_{j=1}^{k} n_j m_j s_j</math>
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where <math>k</math> is the period of calculation (usually, 8), <math>n_j</math> is a first condition:
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  <code>if ((High[j – 2] < Close[j - 7]) && (High[j - 2] < Close[j - 8]) && (High[j] < High[j - 5]) && (High[j] < High[j - 6])) <math>n_j = 0</math>
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  else <math>n_j = 1</math></code>
 
<math>m_j</math> is a second condition:
 
  <code>if ((Low[j – 2] > Close[j – 7]) && (Low[j – 2] > Close[j – 8]) && (Low[j] > Low[j – 5]) && (Low[j] > Low[j – 6])) <math>m_j = 0</math>
  else <math>m_j = 1</math></code>
 
and <math>s_j</math> is the price change parameter:
 
: <math> s_j = High[j] - High[j - 2] + Low[j] - Low[j - 2],\!</math>
 
The second sum is calculated as following:
 
: <math> S2 = \sum_{j=1}^{k} |High[j] - High[j - 2]| + |Low[j] - Low[j - 2]|</math>
 
For each trading day the value of the indicator is calculated:
 
: <math> REI = \frac{S1}{S2} 100</math>
 
==Interpretation==
According to [[Thomas DeMark]], price weakness is shown by the indicator when its value rises above level 60 and then declines below it. Price strength is shown when the REI goes below −60 and then rises above that level.
 
==See also==
* [[Relative strength index]]
 
==References==
{{reflist}}
 
{{technical analysis}}
 
[[Category:Technical indicators]]

Revision as of 22:51, 8 February 2014


What's included in this report may change your lifestyle. If you're thinking of investing, you will need what exactly is supplied in this article, to become effective. If profits are everything you wish and you have the travel and perseverance to keep you undergoing both bad and good occasions, continue reading to discover the secret to achievement. If you commit, be sure that you have practical expectations. Many people understand that except if you get involved in high risk trading, with a substantial possibility of failing, you simply will not have good results using the market immediately.

Keep this in mind as you build up your portfolio to ensure you don't get used benefit of. Don't permit greed or impatience manage your choices in terms of buying the stock market. Buying lower and selling great is a very common suggestion because it makes sense to buy a carry when there's an increased opportunity which it will increase in selling price, even when you have to hold out for some time. A stock's prices are not really the only indication of how pricey it is actually.

Because supply, ideals are contingent on profits, a inventory which costs one hundred money may possibly be inexpensive in the event the earnings' perspective is optimistic. Furthermore, a stock that costs just a few $ $ $ $ might be very high priced when the associated company's getting projections are not dazzling. Opt for the best stocks in a number of market sectors to produce a properly-healthy stock portfolio. The entire  ganhar dinheiro na internet industry tends to expand, but there are a few market sectors which do not see any surge in expansion.

To enhance your portfolio as a whole, you have to have stocks and shares from the sectors that are expanding, and this includes possessing shares from different market sectors. Regular collection re-controlling can minimize any loss in under-performing market sectors, while getting you into other folks which are presently growing. With regards to making an investment, make sure you're informed. Understand the essentials of data processing and stock market record.

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