[R] Weighted box or violin plots in Lattice?

[Deepayan Sarkar]

On Mon, May 9, 2011 at 2:20 AM, Thomas Lumley <tlumley at uw.edu> wrote:
> On Mon, May 9, 2011 at 6:35 AM, Deepayan Sarkar
> <deepayan.sarkar at gmail.com> wrote:
>> On Sat, May 7, 2011 at 1:55 AM, Raphael Mazor <raphaelm at sccwrp.org> wrote:
>>> Is it possible to create weighted boxplots or violin plots in lattice?
>>>
>>> It seems that you can specify weights for panel.histogram() and
>>> panel.densityplot(), but not for panel.bwplot or panel.violin().
>>
>> Not for panel.histogram() either.
>>
>> It's not immediately obvious how you would get weighted boxplots.
>
> The way the survey world does it is to get weighted quantiles and work
> from them, as in survey:::svyboxplot().  The only tricky decision is
> what to do with outliers, since I haven't been able to think of any
> good way of indicating weights on them.

So I guess with bwplot() one would have to write a version of
boxplot.stats() that uses weighted quantiles, and then write a
modified panel function.

A crude approximation (if the weights don't vary too much) may be to
scale and round the weights to integers, and then repeat each data
point; e.g., newx <- rep(x, w), etc.

-Deepayan