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fix two typos (#596)

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Seamus McKinsey 2018-06-20 04:02:17 -04:00 committed by Hadley Wickham
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model-building.Rmd
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@ -111,7 +111,7 @@ ggplot(diamonds2, aes(color, lresid)) + geom_boxplot()
ggplot(diamonds2, aes(clarity, lresid)) + geom_boxplot()
```
Now we see the relationship we expect: as the quality of the diamond increases, so to does it's relative price. To interpret the `y` axis, we need to think about what the residuals are telling us, and what scale they are on. A residual of -1 indicates that `lprice` was 1 unit lower than a prediction based solely on its weight. $2^{-1}$ is 1/2, points with a value of -1 are half the expected price, and residuals with value 1 are twice the predicted price.
Now we see the relationship we expect: as the quality of the diamond increases, so too does its relative price. To interpret the `y` axis, we need to think about what the residuals are telling us, and what scale they are on. A residual of -1 indicates that `lprice` was 1 unit lower than a prediction based solely on its weight. $2^{-1}$ is 1/2, points with a value of -1 are half the expected price, and residuals with value 1 are twice the predicted price.
### A more complicated model