The y-axis of geom_density is not a probability

The y-axis of geom_density is not a probability.
Do you know why?



null_fits <- gss %>%
  specify(hours ~ age + college) %>%
  hypothesize(null = "independence") %>%
  generate(reps = 1000, type = "permute") %>%

null_fits %>% 
  filter(term == "age") %>% 


thank you

The y-axis is the density so if you integrated the area under the entire curve, this will sum to 1. Since the numbers only go from about -0.2 to 0.2, the y value is larger than 1.

For example, a uniform distribution ranging from -0.2 to 0.2 will be at y=2.5 between those values and 0 elsewhere.

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