Backtesting
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Backtesting
BAK-tes-ting
Backtesting is the process of testing a trading or investment strategy using historical data to see how it would have performed in the past.
It helps investors understand a strategy’s profitability, risk, and consistency before using it in real markets. However, even a strong backtest does not guarantee future success, as market conditions keep changing.
A trader creates a strategy to buy Nifty 50 stocks when the 20-day moving average crosses above the 50-day moving average, and sell when it falls below.
Before using it in real trading, the trader tests it on past market data from NSE. The backtest shows key metrics like returns, win rate, drawdowns, and volatility. If the results look consistent and the risk is manageable, the trader may decide to use the strategy in live markets.
- Early ideas similar to backtesting were used by Harry Markowitz while developing Modern Portfolio Theory.
- By analysing how different portfolios would have performed in the past, he showed that diversification can improve returns while reducing risk, shaping modern investment strategies.
Definition
Backtesting is the process of testing a trading or investment strategy using historical data to see how it would have performed in the past.
It helps investors understand a strategy’s profitability, risk, and consistency before using it in real markets. However, even a strong backtest does not guarantee future success, as market conditions keep changing.
Case Study
A trader creates a strategy to buy Nifty 50 stocks when the 20-day moving average crosses above the 50-day moving average, and sell when it falls below.
Before using it in real trading, the trader tests it on past market data from NSE. The backtest shows key metrics like returns, win rate, drawdowns, and volatility. If the results look consistent and the risk is manageable, the trader may decide to use the strategy in live markets.
Historical Reference
- Early ideas similar to backtesting were used by Harry Markowitz while developing Modern Portfolio Theory.
- By analysing how different portfolios would have performed in the past, he showed that diversification can improve returns while reducing risk, shaping modern investment strategies.
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