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They are actually very complimentary - whether Goichi Hosada knew a lot or little about Western style analysis, I don't think we'll ever know. But it is interesting how much his Time, Wave and Price Principles are very complimentary to many of the 'fathers' of technical analysis. Gann though is exceedingly more precise than the Ichimoku System though - but that's normal. Western analysis is rife with 'objective' analysis and stiff rules. Japanese analysis has rules, but allows for much more 'subjective' analysis and interpretation by the analyst.

yes, i know that
but the matter of gann is this in my opinion:
how can you be sure of choosing the corret maximum/minimum?
hosoda's time principle solve the matter using a lot of exact numbers for identifying the day