what is autocorrelation used for 
autocorrelation can be used in many disciplines but is often seen in technical analysis technical analysts evaluate securities to identify trends and make predictions about their future performance based on those trends the bottom lineautocorrelation is the correlation of a time series and its lagged version over time although similar to correlation autocorrelation uses the same time series twice financial analysts and traders use autocorrelation to examine historical price movements and predict future ones technical analysts use autocorrelation to determine what or how much of an impact historical prices of a security have on its future price although a very useful tool it is often used with other statistical measures in financial analysis 