I have a data set where two levels of a variable differ on the x-axis over the range of the y variable, and I'd like to plot a smooth of x~y rather than the usual smooth of y~x. I know that I can reverse the two axes, and that gives a very nice plot. But in the domain of these data, it is traditional to plot x horizontally and y vertically. Is there a way to tell ggplot to do a x~y smooth rather than a y~x smooth? Thanks for any help on this.

Larry Hunsicker

# ggplot2 is it possible to plot a smooth on the y-axis

Does `+ coord_flip()`

do what you need, or am I misunderstanding your question? For example, say we want the regression model `mpg ~ hp`

, but we want `mpg`

on the x-axis and `hp`

on the y-axis. We could do:

```
ggplot(mtcars, aes(hp, mpg, colour=factor(vs))) +
geom_smooth() +
coord_flip()
```

That's it exactly! There seems to be a simple command for everything, but it's often not obvious.

Many thanks, Joel.

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