Frequency Analysis based on Monthly Comb
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Short term fluctuations that seem to repeat with a regular frequency are often (even generally) seen in stock price charts. Through the years, technicians have expended much effort to measure and exploit these cycles. It would appear simple enough to do a frequency analysis on the time series. But the cycles or periods that seem so easy to see in the price data, have proven to be surprisingly difficult to measure by classical methods. The classical methods apply to stationary cycles of exactly regular period. We can easily remove the trends from historical price data to make the series stationary. However, the fluctuations seen in financial data are almost never exactly periodic, a fact that has played havoc with most schemes to exploit the market cycles. One factor in the behaviour of market fluctuations is "Anticipation". When speculators detect a cycle in prices, they will buy earlier before the peak, and sell earlier before the dip. This phenomena causes an increase in frequency, and eventually a breakup of the established cycle. Traditional frequency analysis methods such as the Fourier Transform, break down badly attempting to deal with these irregularities. Wilder estimated that there was an important period of about 28 trading sessions. The half cycle of this period (14 sessions) is a default factor in many of the technical indicators. We have found this to be a reasonable figure, even in today's markets, but there is significant variation between issues. Some companies just seem to have faster or slower cycles for one reason or another, and the indicators may be more accurate when fitted to the situation. The paradoxical condition of variable length periods forces the adoptation of some new forms of analysis. |
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Frequency from Monthly Comb Filter
Representative Cycle (Trading Sessions) = 40.00
Sawtooth = 47.42
| Peak Type | Avg. Cycle | Median Cycle | Cycle Mode | Cycle Amplitude | | High | 16.34 | 30.00 | 14.00 | 20.48 % | | Low | 16.40 | 32.00 | 22.00 | 24.38 % |
| Recent High | Price | Recent Low | Price | Cycle | | | Wednesday, October 20, 2010 | 15.40 | 40 | | Tuesday, October 05, 2010 | 17.82 | | | 15 | | Tuesday, September 14, 2010 | 16.71 | | | 28 | | | Tuesday, August 24, 2010 | 15.03 | 37 | | Wednesday, August 04, 2010 | 17.38 | | | 74 | | | Thursday, July 01, 2010 | 14.33 | 98 | | Tuesday, April 20, 2010 | 19.97 | | | 49 | | | Wednesday, February 10, 2010 | 15.94 | 40 |
Fourier Transform after Digital Filter M | Cycle Length | Fourier Amplitude | | 12 | 0.60 | | 18 | 0.44 | | 20 | 0.32 | | 25 | 0.30 | | 22 | 0.29 | | 34 | 0.22 | | 27 | 0.20 | | 38 | 0.19 | | 31 | 0.18 | | 44 | 0.15 | | 41 | 0.15 |
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Frequency Analysis based on Quarterly Comb
Frequency from Quarterly Comb Filter
Representative Cycle (Trading Sessions) = 95.00
Sawtooth = 51.46
| Peak Type | Avg. Cycle | Median Cycle | Cycle Mode | Cycle Amplitude | | High | 48.93 | 95.00 | 95.00 | 29.60 % | | Low | 48.53 | 74.00 | 55.00 | 18.56 % |
| Recent High | Price | Recent Low | Price | Cycle | | Wednesday, August 04, 2010 | 17.38 | | | 74 | | | Thursday, July 01, 2010 | 14.33 | 98 | | Tuesday, April 20, 2010 | 19.97 | | | 72 | | | Wednesday, February 10, 2010 | 15.94 | 40 | | Tuesday, January 05, 2010 | 18.66 | | | 56 | | | Friday, December 11, 2009 | 16.11 | 71 | | Wednesday, October 14, 2009 | 20.91 | | | 95 | | | Tuesday, September 01, 2009 | 17.82 | 147 |
Fourier Transform after Digital Filter Q | Cycle Length | Fourier Amplitude | | 12 | 0.36 | | 16 | 0.21 | | 18 | 0.20 | | 20 | 0.17 | | 25 | 0.17 | | 59 | 0.15 | | 137 | 0.15 | | 111 | 0.14 | | 216 | 0.14 | | 22 | 0.14 | | 41 | 0.13 |
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Frequency Analysis based on Yearly Comb
Representative Cycle (Trading Sessions) = 0.00
Sawtooth = 51.28
| Peak Type | Avg. Cycle | Median Cycle | Cycle Mode | Cycle Amplitude | | High | 0.00 | 0.00 | 0.00 | 0.00 % | | Low | 0.00 | 0.00 | 0.00 | 0.00 % |
| Recent High | Price | Recent Low | Price | Cycle | | Monday, June 01, 2009 | 23.46 | | | 410 | | | Monday, February 02, 2009 | 14.86 | 426 | | Friday, October 12, 2007 | 61.40 | | | 234 | | | Thursday, May 24, 2007 | 46.62 | 243 | | Monday, November 06, 2006 | 59.25 | | | 420 | | | Tuesday, June 06, 2006 | 40.88 | 406 | | Wednesday, March 09, 2005 | 69.46 | | | 233 | | | Monday, October 25, 2004 | 44.00 | 445 |
Fourier Transform on Raw Closing Prices | Cycle Length | Fourier Amplitude | | 819 | 2.52 | | 512 | 2.37 | | 683 | 2.08 | | 9 | 1.74 | | 585 | 1.69 | | 12 | 1.55 | | 216 | 1.54 | | 341 | 1.39 | | 372 | 1.33 | | 293 | 1.22 | | 178 | 1.17 |
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| ERTS
Electronic Arts Inc.
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Average Sawtooth based on Monthly Combo
| ERTS
Electronic Arts Inc.
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Average Sawtooth based on Bi-weekly Combo
Comparing the length of time from high points to successive lowpoints, against the corresponding time span from the lows to the following periodic highs, gives us the Sawtooth Indicator. The mid-point, corresponding to a perfect sine wave, is 50 percent. Values less than this indicate the sell slope is steeper than the buy slope, while values over 50 percent show the opposite. The Sawtooth Statistic gives a clue to the general mood of the markets, functioning as a sort of sentiment indicator. The chart represents the sawtooth percentage of (approximately) monthly cycles over the past year, and of the (approximately) bi-weekly cycles, averaged over the past six months.
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