overlaying frequency histograms or density plots in R

[Bogdan Tanasa]

Dear all, we do have a dataframe with a FACTOR called EXP that has 3 LEVELS ; 

 head(pp_ALL)
    VALUE  EXP
1 1639742 DMSO
2 1636822 DMSO
3 1634202 DMSO

shall i aim to overlay the relative frequency histograms, or the density histograms for the FACTOR LEVELS, 

please would you let me know why the following 2 pieces of R code show very different results : 

ggplot(pp_ALL, aes(x=VALUE, colour=EXP)) + geom_density()

versus 

ggplot(data=pp_ALL) +
       geom_histogram(mapping=aes(x=VALUE, y=..density.., colour=EXP),  bins=1000) 

and which is the correct way to display the data ? thanks, 

bogdan 

ps : i have emailed to the folks on R-help too ..

[Bogdan Tanasa]

Dear Ram, thank you for your quick email. 

here i have attached the figures please : 

<> figure1 : ggplot(pp_ALL, aes(x=VALUE, colour=EXP)) + geom_density()

<> figure2 : ggplot(data=pp_ALL) +

+        geom_histogram(mapping=aes(x=VALUE, y=..density.., colour=EXP),  bins=1000)

in terms of data interpretation, the figure1 makes more sense, i would say. thanks :)

-- bogdan

On Wed, Feb 24, 2021 at 2:17 PM Ram Siwakoti <rsiwa...@gmail.com> wrote:

Hi Bogdan, 

The first code may not be creating the histogram at all. If you want a histogram with density plot overlayed as you mentioned, the second code should produce the correct plot you are looking for, no?

-- Ram 

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[Ram Siwakoti]

Hi Bogdan, 

The first code may not be creating the histogram at all. If you want a histogram with density plot overlayed as you mentioned, the second code should produce the correct plot you are looking for, no?

-- Ram 

On Wed, Feb 24, 2021, 5:08 PM Bogdan Tanasa <tan...@gmail.com> wrote:

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