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7/27/2019 S6_Fundamental of Technical Analysis and Algorithmic Trading
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Saeed Ebrahimijam
Spring 2012-2013
Faculty of Business and EconomicsDepartment of Banking and Financeu Akdeniz niversitesi
FINA417
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How Trendlines Are Drawn Significance of Trendlines
Validity of Trendlines Penetration
Curved Trendlines Trendline Role reversal
Trend Channel
The Fan Principle
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A trendline is simply a straight line thatconnects a series of security prices, eithertops or bottoms.
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An up trendline is a straight line that connects a seriesof reaction lows.
Note that the trendline appears at the bottom of the
price pattern and is drawn up and to the right.
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A down trendline is a straight line that connects a seriesof rally tops.
Note that, in this case, the trendline is at the top of theprice pattern. It is drawn down and to the right.
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There must be at least two tops or bottoms tobegin a trendline. (This makes sense, becauseone must have two points in order to draw astraight line.)
After drawing a trendline based on two topsor bottoms, one will frequently find that ahigher top or lower bottom has been made,requiring the trendline to be redrawn.
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The significance of a trendline is determinedby two factors:
1- the number of points (tops or bottoms) thatthe trendline goes through.
2- the length of time the trendline haspersisted without being penetrated.
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The length of the trendline indicates theperiod of time that prices have remainedabove or below the trendline.
Obviously, the longer that period lasts, thegreater the significance of the trendline.
- For example, a trendline that has not beenpenetrated for 10 months is more significant
than one that has held for 10 weeks or 10days.
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In addition to the number of points that atrendline goes through and the length of time thetrendline has persisted, some technicians feel theangle of the trendline adds to the significance ofa trendline.
In general, the closer to horizontal the trendlineis, the greater the significance of any penetrationthrough it.
Very steep trendlines can easily be broken bybrief sideways consolidation moves;
trendlines that are less steep are not subject tomany short-term price movements (that areoften inconsistent with the current trend).
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Once a trendline has been established, achange in the direction of the trend issignaled by prices breaking through thetrendline.
In the case of an up trendline, this occurs asillustrated in Figure 6-4. Figure 6-5 showsthe penetration of a down trendline.
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Two criteria are used to determine the validity of trendlinepenetration.- The firstcriterion is the extent of penetrationhow farprices have moved past the trendline?
There is no right answer to the question: How far do priceshave to move before the breaking of a trendline isconsidered valid? It depends to a great degree on thevolatility of the security. However, some technicians use a3 percent rule in regard to stocks. If the closing price forthe day is 3 percent lower (for an up trendline) or higher(for a down trendline), then the penetration is viewed as
decisive and valid. The 3 percent move does not have tohappen in one day, although it is not unusual for prices todo so.
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Some technicians also use a time filter.- For example, if prices close above an uptrendline or below a down trendline for twodays in a row, it is viewed as a validpenetration, and prices are likely to continuetheir reversal.
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Price penetrate for a few hours(Intraday) and then
close in itsprevious situation. It is not consideras trendline penetration. Because, at the end ofthe day analysts will look at the close prices.
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The second criterion relates to the volume. The validity of a trendline penetration is
enhanced if it is accompanied by expandingvolume (especially when down trendlines arebroken by high volume).
However, it is not essential for volume toincrease for there to be a valid penetration.
In other words, the extent of penetration(price) is more important than its volumecharacteristics.
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A trendline is normally thought of as a straight line. It is not unusual for an advance or decline in prices to rapidlypick up momentum and move away from an established
trendline in a curving fashion.- If this curving occurs after an extended rise in prices, it signals
the potential for a buying climax blowoff).- On the other hand, if the curving action happens following anextended decline in prices, it warns you of the possibility of aselling climax. In both cases, as momentum accelerates and prices move almost
vertically, volume typically reaches an abnormally high level. An upcurving trendline connects a series of reaction lows in an
uptrend, while a downcurving trendline is drawn through a series
of rally highs. Both can be drawn with a Frenchcurve. Significant penetration of a curved trendline is as valid as that of
a straight trendline. It signals a change in the direction of thetrend.
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Once a trendline is decisively penetrated, itnormally changes its role from one of support toone of resistance for an up trendline (see Figure6-7) or resistance to support for a down
trendline (see Figure 6-8). More about supportand resistance is presented in Lesson 7.
Note : in both Figures 6-7 and 6-8 that pricesfirst moved away from the trendline, then back to
it, and then away again. This is called a pullbackand is not uncommon. Pullbacks offer investorsgreat entry points for buying or selling short
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In many instances, prices repeatedly moveabout the same distance away from atrendline before returning to the trendline. Inthese cases, a straight line can be drawn
connecting the peaks of rallies in an uptrendor the bottoms of declines in a downtrend.That line is often parallel to the trendline andis called a return or channel line. Togetherthe channel line and trendline create a trendchannel, a range within which prices aremoving.
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Figures 6-9 and 6-10 illustrate trendchannels in an uptrend and downtrend,respectively Well-defined trend channelsappear most frequently in charts of actively
traded securities. Thinly traded securities offer little
opportunity for trend channels to develop.
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Novice techniciansoften use trend channels todetermine good profit-taking levels.
For example, in an uptrend, they will sell astock when it reaches the upper level of itstrend channel.
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More experienced technicians watch pricemovements within the two boundary lines of thetrend channel looking for a warning signal thatthe trend direction is changing.
If, in an upward trend channel, prices rally upfrom the trendline but fail to reach the upperchannel line, it signals a deterioration of thetrend and the probability that the lower line willbe broken.
Frequently, the distance from the top of thefailed rally to the channel line equals the distanceby which the next move down penetrates thetrendline.
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Similarly, in a downward trend channel, ifprices drop from the trendline but fail toreach the bottom channel line, it signals adeterioration of the trend and probability that
the upper line will be broken. Likewise, the distance from the bottom of the
failed attempt to reach the channel line to thechannel line often is equal to the distance bywhich the next rally penetrates the trendline.
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If prices break through the upper line in an
upward trend channel, an acceleration of theexisting uptrend is signaled. At this point,some investors will buy additional positions.
On the other hand, if prices move through thebottom line of a downward trend channel, the
existing downtrend appears to be picking upspeed. Short positions may be increased atthis point.
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It is called the fan principle because it reflects the drawing ofthree trendlines that together look like a fan.In an upward trending fan: An initial trendline is drawn connecting the low prices in a
normal fashion. The trendline is broken, and prices move to a lower point from
which they rally back to the bottom of the trendline (which nowacts as resistance instead of support). A second trendline is drawn from the low beginning of the first
trendline and the low of the penetration through the firsttrendline. Prices once again decline and break through thesecond trendline creating a new low. They then rally up to thebottom of the second trendline.
The third and final trendline is drawn from the low beginning thefirst trendline and the low just created.
When prices subsequently fall and break through the thirdtrendline a reversal in prices is signaled. at list in the Mid-t rm
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Similar to an upward trending fan, thebreaking of the third trendline is what signalsa reversal in prices.
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