.

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# Quiz

What could go wrong?

$$ \sqrt{\frac{1}{n} \sum_{i=1}^n (\hat{y}_i - {y}_i)^2 }$$ 


.footnote[Root Mean Squared Error]

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# RMSE

Root Mean Squared Error - The standard deviation of the residuals about zero.

$$ \sqrt{\frac{1}{n} \sum_{i=1}^n (\hat{y}_i - {y}_i)^2 }$$ 

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class: middle, center

# `rmse()*`

Calculates the RMSE based on two columns in a dataframe: 

The .display[truth]: `\({y}_i\)` 

The predicted .display[estimate]: `\(\hat{y