
Python for Algorithmic Trading Cookbook
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Algorithmic traders often seek exposure to specific risks that they believe will yield outsized returns while hedging other risks they deem unfavorable or unnecessary. For instance, a trader might want exposure to stocks with the lowest price-to-earnings ratios, believing they will outperform while hedging against the broader market risk. This selective exposure helps traders maximize returns by capitalizing on perceived opportunities while minimizing the potential downside by hedging against certain risks.
Factor models are a way of explaining the returns of an asset or portfolio through a combination of the returns of another asset, portfolio, or factor. The general form of a factor model using a linear combination is as follows:
Y = α + β 1 X 1 + β 2 X 2 + β n X n
The sensitivity of portfolio returns to a risk factor X is described by the beta. It’s the...