This is a percentage measurement that characterizes performance oof a screener compared to the benchmark, while accounting for the beta it takes to get said performance. The higher the alpha, the larger the outperformance. A negative alpha implies underperformance compared to the benchmark.
Note: Even if the annualized returns are higher than the benchmark index, if it takes a lot of beta (volatility) to achieve the outperformance, alpha could still be negative.
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