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Sigma3x's avatar

I have great respect for the research and line of thinking in this article re. cycles. However, I have also done cycle work just like this on Bitcoin (and others) for many years, and I have even used the exact same tool as Lars von Thienen has used in this article (meaning I have used his cycle software tool that showed the three dominant cycles). His software is totally first rate, but the problem is that no matter how good these cycles look when fitted to past data (as was done in this article), the out-of-sample forward projections of these cycles often (maybe even usually) differs considerably from what that future price action actually does. In other words, with powerful spectral analysis tools like those used for this article, it's actually very easy to get good looking models fitted to the past data. But it's very hard and rare for those models to **accurately** predict the future movement of the time series; the data series usually do not follow what the model was predicting all that well. Sometimes they do, and often they do not. And that is one of the main problems: you never know ahead of time if your cycle predictions are going to be in the minority class that work out well, or in the majority class that don't.

What is very badly needed within any article like this one is some walk-forward testing. We need to see several graphs showing how well these cycle-based predictions actually do going forward on future data they have not been fitted to. For instance, use the exact same methodology as was used here, but fit the model only on data up to, say 1/1/2022. Then show the forward projection from the model over say the next 6-12 months and overlay the actual price series on top of that so that we can see how well the model was able to predict. Then do the exact same thing for fitted data up to, say 1/1/2023. Then show how well the model did from there going forward. etc. This is called walk-forward testing, and it is absolutely necessary when analyzing prediction models such as those presented in this article. I would never trust a prediction model that was not rigorously examined in this way.

Again, thanks very much for a good first step and for this line of research and modeling. It's a very good first step, but it's still very far from a proper analysis.

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Freedom Architect's avatar

The GLI wave chart looks old specially the level showing for 2025 and projected peak around Sept 2025. This was revised few months back for the peak to occur in H1 2026.

Need some correction, Michael?

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