# Impulse Wave Structural Score and Corrective Wave Structural Score

Figure 5-11: Example of complex wave counting fitted to chart.

Therefore, for better trading practice, we recommend “approach of the pattern detection” rather than “approach of fitting the wave counting”. We strongly emphasize not to use inaccurate wave counting for your decision-making. Instead, you can only rely on the wave patterns meeting certain quality for your trading. The question is how do we differentiate accurate pattern from inaccurate patterns? In order to assess the accuracy of wave patterns, we can revisit the pattern matching accuracy from the Harmonic Pattern. To recap what is the pattern matching accuracy in the case of Harmonic Pattern, it is the metrics showing how close our detected harmonic pattern matches to the perfect pattern made up from the ideal Fibonacci ratios. The concept of the pattern matching accuracy can be extended for the case of Elliott Wave counting too. Since three wave rules and the Fibonacci ratios provide the guideline for the quality of the pattern, we can incorporate such information into these error metrics as we did in the case of harmonic patterns:

Figure 5-12: Some possible Error Metrics for Elliott Wave pattern matching.

Once again, we can use the Mean Absolute Percent Error to quantify the pattern matching error for each Elliott Wave pattern.

Pattern matching accuracy can be calculated simply using the following formula:

Pattern matching accuracy (%) = 100 – Pattern matching error (%).

For both impulse wave and corrective wave, we can name the pattern matching accuracy as the Impulse Wave Structural Score (IWSS) and Corrective Wave Structural Score (CWSS). Since the term “impulse” and “motive” are used interchangeably. One can call the Impulse Wave Structure Score to Motive Wave Structural Score too. Simply speaking, Impulse Wave Structural Score tells you how closely the identified impulse wave pattern matches to the structure of the ideal impulse wave pattern. Likewise, Corrective Wave Structural Score tells you how closely the identified corrective wave pattern matches to the structure of the ideal corrective wave pattern. To give you working example on using the impulse Wave Structural Score and Corrective Wave Structural Score, consider our previous example with two candidate peaks for wave 3. With first candidate peak, our calculation for impulse Wave Structural Score was 83.7%. With second candidate peak, our calculation for impulse Wave Structural Score was 95.5%. This number support our conclusion made from our six steps. From our experience, Wave Structural Score below 80% considered as poor quality. For the decision making for trading, it is advised to use the Wave Structural Score over 80%. If you have two or three alternative scenarios for your wave counting at least satisfying three wave rules, then you can always choose the scenario with maximum Wave Structural Score. What if you never find any wave patterns that meet over 80% of Wave Structural Score at best, then you should not trade. It is always much better not to trade than trading with inaccurate pattern.

Figure 5-13: Impulse Wave Structural Score comparison. Impulse Wave Structural Score on the left was calculated when the first peak is considered as wave 3. Impulse Wave Structural Score on the right was calculated when the second candidate peak is considered as wave 3.

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