[R] density with weights missing values

[Bert Gunter]

The behavior is as documented AFAICS.

na.rm
logical; if TRUE, missing values are removed from x. If FALSE any
missing values cause an error.

The default is FALSE.

weights
numeric 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 along
and 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 along
and 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 deleted]]
> >
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>
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