CODEWITHSUNDEEP
rggplot2
user4400727
user4400727

Reputation:

confindence intervals extend below zero in ggplot

The confidence intervals in my plot extend beyond zero making the y axis go below zero. Any way to adjust this in ggplot so the confidence intervals doesn't go below zero while keeping the y axis limits as is? enter image description here

Upvotes: 1

Views: 1105

Answers (2)

Remy
Remy

Reputation: 97

You can use this option for y-axis (and similarly for x-axis):

scale_y_continuous(limits = c(min_y,max_y), oob=squish)

Upvotes: 0

thc
thc

Reputation: 9705

Use geom_ribbon:

Example data:

set.seed(1)
df <- data.frame(x = 1:100, y = pmax(0, 35 - 1:100 * runif(100) ))
fit <- lm(y ~ x, data=df)
pred_df <- data.frame(x=df$x, predict(fit, interval="confidence"))

ggplot() + geom_point(aes(x=x, y=y), data=df) +
  geom_ribbon(aes(x=x, ymin=pmax(0,lwr), ymax=upr), alpha=0.5, data=pred_df) + scale_y_continuous(limits=c(min(pred_df$lwr), NA) )

enter image description here

Upvotes: 3

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