[R] density with weights missing values

[Jeff Newmiller]

I think the missing weights are more crucial than equally-weighted missing data would be.

what if there is a heavy weight on the missing values? it could completely change the interpretation of the result.

On July 12, 2021 10:22:19 AM PDT, matthias-gondan <matthias-gondan using gmx.de> wrote:
>You're right, of course. Extrapolating your argument a bit, the whole
>practice of na.rm is questionable, since there's always a reason for
>missingness (that is not in x and rarely elsewhere in the data)Best
>wishes Matthias 
>-------- Ursprüngliche Nachricht --------Von: Jeff Newmiller
><jdnewmil using dcn.davis.ca.us> Datum: 12.07.21  18:44  (GMT+01:00) An:
>r-help using r-project.org, matthias-gondan <matthias-gondan using gmx.de>, Bert
>Gunter <bgunter.4567 using gmail.com> Cc: r-help using r-project.org Betreff: Re:
>[R] density with weights missing values Sure, you might think that.But
>most likely the reason this code has not been corrected is that when
>you give weights for missing data the most correct result is for your
>entire density to be invalid.Fix your inputs so they make sense to you
>and there is no problem. But absent your intellectual input to
>restructure your problem the weights no longer make sense once
>density() removes the NAs from the data.On July 12, 2021 9:13:12 AM
>PDT, matthias-gondan <matthias-gondan using gmx.de> wrote:>The thing is that
>for na.rm=TRUE, I would expect the weights>corresponding to the missing
>x to be removed, as well. Like in>weighted.mean. So this one shouldn't
>raise an error,density(c(1, 2, 3,>4, 5, NA), na.rm=TRUE, weights=c(1,
>1, 1, 1, 1, 1))Or am I missing>something? >-------- Ursprüngliche
>Nachricht --------Von: Bert Gunter><bgunter.4567 using gmail.com> Datum:
>12.07.21  16:25  (GMT+01:00) An:>Matthias Gondan
><matthias-gondan using gmx.de> Cc: r-help using r-project.org>Betreff: Re: [R]
>density with weights missing values The behavior is as>documented
>AFAICS.na.rmlogical; if TRUE, missing values are removed>from x. If
>FALSE anymissing values cause an error.The default
>is>FALSE.weightsnumeric vector of non-negative observation weights.NA
>is>not a non-negative numeric.Bert Gunter"The trouble with having an
>open>mind is that people keep coming alongand sticking things into
>it."-->Opus (aka Berkeley Breathed in his "Bloom County" comic strip
>)Bert>Gunter"The trouble with having an open mind is that people keep
>coming>alongand sticking things into it."-- Opus (aka Berkeley Breathed
>in his>"Bloom County" comic strip )On Mon, Jul 12, 2021 at 6:10 AM
>Matthias>Gondan <matthias-gondan using gmx.de> wrote:>> Weighted mean
>behaves>differently:> • weight is excluded for missing x> • no warning
>for>sum(weights) != 1>> > weighted.mean(c(1, 2, 3, 4), weights=c(1, 1,
>1,>1))> [1] 2.5> > weighted.mean(c(1, 2, 3, NA), weights=c(1, 1, 1,
>1))>>[1] NA> > weighted.mean(c(1, 2, 3, NA), weights=c(1, 1, 1,
>1),>na.rm=TRUE)> [1] 2>>>>> Von: Richard O'Keefe> Gesendet: Montag,
>12.>Juli 2021 13:18> An: Matthias Gondan> Betreff: Re: [R] density
>with>weights missing values>> Does your copy of R say that the weights
>must>add up to 1?> ?density doesn't say that in mine.   But it does
>check.>>>On Mon, 12 Jul 2021 at 22:42, Matthias Gondan
><matthias-gondan using gmx.de>>wrote:> >> > Dear R users,> >> > This works as
>expected:> >> > •>plot(density(c(1,2, 3, 4, 5, NA), na.rm=TRUE))> >> >
>This raises an>error> >> > • plot(density(c(1,2, 3, 4, 5, NA),
>na.rm=TRUE,>weights=c(1, 1, 1, 1, 1, 1)))> > • plot(density(c(1,2, 3,
>4, 5, NA),>na.rm=TRUE, weights=c(1, 1, 1, 1, 1, NA)))> >> > This seems
>to work (it>triggers a warning that the weights don’t add up to 1,
>which makes>sense*):> >> > • plot(density(c(1,2, 3, 4, 5, NA),
>na.rm=TRUE,>weights=c(1, 1, 1, 1, 1)))> >> > Questions> >> > • But
>shouldn’t the>na.rm filter also filter the corresponding weights?> > •
>Extra>question: In case the na.rm filter is changed to filter the
>weights,>the check for sum(weights) == 1 might trigger false positive
>warnings>since the weights might not add up to 1 anymore> >> > Best
>wishes,> >>>> Matthias> >> >> >         [[alternative HTML version
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