[R] questions regarding stat_smooth in ggplot area plot

[jovian]

Hello,

I drew a simple area plot using ggplot2 using

set <- read.table(file="http://www.jovian.nl/set.csv", head=1,  sep=",")
library(ggplot2)
ggplot() + 
layer(
  data = set, mapping = aes(x = time, y = hours),
  geom = "area", stat="smooth", color="red"
) +
layer(
  data = set, mapping = aes(x = time, y = hours),
  geom = "area", color="red", fill="red", alpha="0.5"
) 

I have two questions about this visualisation:

- The smooth function is too "rough" right now, how do I make it follow the
original values more closely?
- The smooth function turns up with negative values (e.g. at the beginning):
How do I prevent this? (e.g. to use 0 instead of any negative value.)

Thanks,

Werner


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