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Alcoa Corporation has current Downside Deviation of 0.0. Downside Deviation (or DD) is measured by target semi-deviation (the square root of target semi-variance) and is termed downside risk. It is expressed in percentages and therefore allows for rankings in the same way as standard deviation. An intuitive way to view the downside risk is the annualized standard deviation of returns below the target.

Downside Deviation | = | SQRT(DV) |
| = | 0.0 |

## Downside Deviation Comparison

Alcoa Corporation is rated

**below average** in downside deviation category among related companies. It is rated

**below average** in total risk alpha category among related companies .

It is the square root of the probability-weighted squared below-target returns. The squaring of the below-target returns has the effect of penalizing failures at an exponential rate. This is consistent with observations made on the behavior of most private investors.

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