Message-ID: <CAPK=JisKQpPcscD1fobKtyiTA17YPDXQ5NSn2d+kMSEdSkb6-g@mail.gmail.com>
Date: 2019-03-15T14:21:24Z
From: Stefan Schreiber
Subject: density vs. mass for discrete probability functions
In-Reply-To: <098EE006-5A68-4145-B5B2-3A1D5DEC295D@gmail.com>
Thank you Peter and Spencer. That clears things up. Also since no one
responded the second part of my question, I'm still wondering if it was
noted that there is a hyperlink in the dbinom help file (?dbinom) that
isn't directing correctly?
Stefan
On Fri, Mar 15, 2019, 07:37 peter dalgaard, <pdalgd at gmail.com> wrote:
> Mathematically, you can bring discrete and continuous distributions on a
> common footing by defining probability functions as densities wrt. counting
> measure. You don't really need Radon-Nikodym derivatives to understand the
> idea, just the fact that sums can be interpreted as integrals wrt counting
> measure, hence sum_{x in A} f(x) and int_A f(x) dx are essentially the same
> concept.
>
> -pd
>
> > On 15 Mar 2019, at 01:43 , Stefan Schreiber <sschreib at ualberta.ca>
> wrote:
> >
> > Dear R users,
> >
> > While experimenting with the dbinom() function and reading its
> > documentation (?dbinom) it reads that "dbinom gives the density" but
> > shouldn't it be called "mass" instead of "density"? I assume that it
> > has something to do with keeping the function for "density" consistent
> > across discrete and continuous probability functions - but I am not
> > sure and was hoping someone could clarify?
> >
> > Furthermore the help file for dbinom() function references a link
> > (http://www.herine.net/stat/software/dbinom.html) but it doesn't seem
> > to land where it should. Maybe this could be updated?
> >
> > Thank you,
> > Stefan
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > PLEASE do read the posting guide
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> > and provide commented, minimal, self-contained, reproducible code.
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
>
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