DEFINITION of 'Historical Returns'
The past performance of a security or index. Analysts review historical return data when trying to predict future returns, or to estimate how a security might react to a particular situation, such as a drop in consumer demand. Historical returns can also be useful when estimating where future points of data may fall in terms of standard deviations.
INVESTOPEDIA EXPLAINS 'Historical Returns'
Looking at historical data can provide some insight into how a security or market has reacted to a variety of different variables, from regular economic cycles to sudden world events. Investors looking to interpret historical returns should keep one caveat in mind: you can't assume that the future will be like the past. The older the historical return data is, the more likely it is to be less useful when predicting future returns.

Sacred Cow
A firmly held mainstream belief that is considered to be true ... 
Standard Deviation
1. A measure of the dispersion of a set of data from its mean. ... 
Historical Volatility  HV
The realized volatility of a financial instrument over a given ... 
Record Low
The lowest historical price level reached by a security, commodity ... 
Correlation
In the world of finance, a statistical measure of how two securities ... 
Record High
The highest historical price level reached by a security, commodity ...

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