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Historical analysis is a major component of technical analysis which involves looking at past events or trends in order to get a better understand of current or possibly even future conditions. The basic premise of historical analysis is that "history repeats itself". Analysts can look back in time to view how specific markets reacted under certain conditions or during specific events. For example, an analyst might look back in time at how a market reacted compared to Bollinger Bands readings. By looking back while experimenting with different Bollinger Bands Widths, a proper Bands Width might present itself which is more suitable than a uniform, default width.