Technical Analysis

An Introduction to Technical Analysis (.pdf)
SEWELL, Martin, 2011. Characterization of financial time series. Research Note RN/11/01, University College London, London.

Technical analysis is the forecasting of market prices by means of analysis of data generated by the process of trading.

Technical analysis relies on the assumption that markets discount everything except information generated by market action, ergo, all you need is data generated by market action.