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How to create smooth density curves without filling densities in R?
The density curves can be created by using stat_density function of ggplot2 package but it fills the curve with density hence it becomes difficult to recognize the curves. We can remove these densities by using geom="line" inside the stat_density function so that only the density curves will be plotted.
Example
Consider the below data frame:
> G<-sample(LETTERS[1:4],20,replace=TRUE) > Response<-rnorm(20,1,0.34) > df<-data.frame(G,Response) > df
Output
G Response 1 C 1.0229016 2 C 1.0058160 3 B 0.8831558 4 B 0.7729167 5 C 0.9130468 6 D 0.8431893 7 B 1.5003581 8 A 0.9687335 9 B 1.1139661 10 A 0.9211660 11 A 1.1790619 12 D 0.6349671 13 A 1.2616918 14 A 1.6021078 15 C 0.9332981 16 C 1.0696149 17 D 0.7971567 18 C 1.4006042 19 C 1.3568032 20 A 1.1907336
Loading ggplot2 package and creating density curve without filling the densities:
Example
> library(ggplot2) > ggplot(df,aes(Response))+stat_density(aes(group=G,color=G),position="identity",geom="line")
Output:
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