Sorry, Bert.
The fitdistr function estimates parameters via maximum likelihood.
(i.e. The "lognormal" part of this, is not a kernel).
On Fri, Jan 22, 2021 at 5:14 AM Bert Gunter <bgunter.4567 at gmail.com>
wrote:>
> In future, you should try to search before posting. I realize that getting
> good search terms can sometimes be tricky, but not in this case: 'plot
> density with histogram in R' or similar on rseek.org or just on your
usual
> search platform brought up several ways to do it.
>
> As a (slightly offtopic) side issue, be careful with this: both histograms
> and smooth density estimates are just that: density **estimates** that
> depend on both the data and various parameters, e.g. the location of the
> bins for histograms and kernel for kernel density estimates. You may
> therefore get plots where the two do not appear to "match" when
you use the
> defaults for each.
>
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along
and
> sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip
)
>
>
> On Thu, Jan 21, 2021 at 3:54 AM Eric Leroy <leroy at icmpe.cnrs.fr>
wrote:
>
> > Hi,
> >
> > I would like to plot the histogram of data and fit it with a lognormal
> > distribution.
> >
> > The ideal, would be to superimpose the fit on the histogram and write
> > the results of the fit on the figure.
> >
> > Right now, I was able to plot the histogram and fit the density with a
> > lognormal, but I can't combine all together.
> >
> > Here is the code I wrote :
> >
> > histdata <- hist(dataframe$data)
> >
> > library(MASS)
> >
> > fitdistr(histdata$density, "lognormal")
> >
> > Can you help me ?
> >
> > Best regards,
> >
> > --
> >
> > *Eric Leroy*
> >
> > /Responsable de la plateforme microscopie ?lectronique/
> >
> > /Correspondant S?curit? des Syst?mes Informatiques de l'ICMPE/
> >
> > ICMPE - UMR 7182 - CNRS - UPEC
> >
> > 2/8, rue Henri Dunant
> >
> > 94320 Thiais
> >
> > T?l : 01.49.78.12.09
> >
> > Fax : 01.49.78.12.03
> >
> > courriel : leroy at icmpe.cnrs.fr <mailto:leroy at
icmpe.cnrs.fr>
> >
> > Page Web : : http://www.icmpe.cnrs.fr <http://www.icmpe.cnrs.fr>
> >
> > ______________________________________________
> > R-help at 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.
> >
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.