Hi.
My understanding is that position dodge places each bar in each histogram beside each other and position stack places all respective bars atop each other. Relative frequency is something different. Cheers Petr From: Bogdan Tanasa <tan...@gmail.com> Sent: Thursday, February 25, 2021 8:43 AM To: PIKAL Petr <petr.pi...@precheza.cz> Cc: r-help <r-help@r-project.org> Subject: Re: [R] overlaying frequency histograms or density plots in R Thanks a lot Petr ! shall i uses "dodge" also for the RELATIVE FREQUENCY HISTOGRAMS : p <- ggplot(iris, aes(x=Sepal.Length, y=..count../sum(..count..)*100, colour=Species)) p+geom_histogram(position="dodge") or is there any other way to display the RELATIVE FREQUENCY HISTOGRAMS ? thanks again ! On Wed, Feb 24, 2021 at 11:00 PM PIKAL Petr <petr.pi...@precheza.cz <mailto:petr.pi...@precheza.cz> > wrote: Hi You should use position dodge. p <- ggplot(iris, aes(x=Sepal.Length, colour=Species)) p+geom_density() p <- ggplot(iris, aes(x=Sepal.Length, y=..density.., colour=Species)) p+geom_histogram(position="dodge") Cheers Petr > -----Original Message----- > From: R-help <r-help-boun...@r-project.org > <mailto:r-help-boun...@r-project.org> > On Behalf Of Bogdan Tanasa > Sent: Wednesday, February 24, 2021 11:07 PM > To: r-help <r-help@r-project.org <mailto:r-help@r-project.org> > > Subject: [R] overlaying frequency histograms or density plots in R > > 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) > > thanks, > > bogdan > > ps : perhaps i shall email to the folks on ggplot2 mailing list too ... > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org <mailto:R-help@r-project.org> mailing list -- To > UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code.
______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
