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rggplot2density-plot

density curve plot in ggplot

I am new in ggplot and I am trying to draw a density curve. This is a simplified version of the code that I am trying to use:

ggplot(data=ind1, aes(ind1$V1)) + 
geom_density(fill = "red", colour = "black") + xlim(0, 30)

The density curve plot that I get looks like this: enter image description here

I do not understand what is wrong here! does anyone have any idea what is wrong?

Solution

  • Use the adjust parameter.

     ggplot(data=iris, aes(iris$Sepal.Length)) + 
 geom_density(fill = "red", colour = "black",adjust=3) + xlim(0, 30)

    Just so you can compare how the parameter affects the smoothing: 

     ggplot(data=iris, aes(iris$Sepal.Length)) + 
 geom_density(fill = "red", colour = "black",adjust=1/2) + xlim(0, 30)

    Try a couple different values (I think a little greater than 1 will produce the result you want).