[R] qqnorm() with weighted data?

[Thomas Lumley]

On 10 May 2002, Russell Senior wrote:

>
> I've got a set of data that are weighted by a largish integer (ranging
> from about 50K to 1.5 million).  I'd like to plot CDF's for this data
> taking into account the weighting.  What do you recommend?
>

I'd use stepfun() in the "stepfun" package.  If necessary, use aggregate
to sum the weights over unique values and then divide by the total weight
to get probabilities for the observed values, get cumulative sums with
cumsum() and then feed these to stepfun

	-thomas

Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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