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another typo (#337) 

should've bundled these two - will do next time!
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seamus-mckinsey 2016-08-29 18:35:41 -04:00 committed by Hadley Wickham
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model-building.Rmd
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@ -116,7 +116,7 @@ ggplot(diamonds2, aes(color, lresid)) + geom_boxplot()
ggplot(diamonds2, aes(clarity, 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 pirce. 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 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.
### A model complicated model ### A model complicated model