Restrict X axis after stat_ecdf in ggplot?

Question

How do I change the X axis of stat_ecdf, but not change the calculation of ecdf?

Example code:

df <- data.frame(x=c(1,2,3,4,5))

# 1 to 5
ggplot(df, aes(x)) + stat_ecdf()

# 1 to 3, but stat_ecdf no longer calculated on the whole range
ggplot(df, aes(x)) + stat_ecdf() + scale_x_continuous(limits=c(NA,3))

The first graph gets to 1.0 by 5, as I'd expect:

The second graph goes from 1 to 3 (good), but ends up at y=1 instead of y=0.66:

This is likely because the stat_ecdf has been calculated over the visible window, but I want it calculated over all the data.

I'm pretty sure I've asked this before, but I can't find it.

Answer 1

In general, the points are removed before the summary statistics are calculated. Using coord_cartesian() gets around this. Try:

ggplot(df, aes(x)) + stat_ecdf() +
  coord_cartesian(xlim = c(0, 3))

Answer 2

My guess is that you're missing the aesthetics ymin and ymax that geom_ribbon requires. You might try:

    Graph <-  ggplot(df, aes(x = var_x, fill = year, ymin = ..y..-0.1, ymax = ..y..+0.1)) + 
    stat_ecdf( geom = "ribbon") +
    coord_cartesian(xlim = c(0, 3))

If that doesn't work, you might reply with the data frame, df, you're using and the error message you see. Thanks, Eugene