Looked through the publication, "Statistical Methods and Mathematical Algorithms Used in Sudaan" (Shah, et al, 1993) but the only reference to variances on quantiles is a 1991 presentation by David Binder.  Googled the title and got this link.
 
http://www.amstat.org/sections/srms/Proceedings/papers/1991_005.pdf
 
Point estimation (section 1 of this reference) is already implented in R; variance estimatation for quantiles is presented in the last part of section 3.  Can you make sense of it?  It's beyond me.
 
Fred

Fred Rohde <frohde_home@yahoo.com> wrote:
Thanks. I'll update the survey package. Sudaan does the standard errors on quantiles using Taylor series. If I can hunt down the formula it uses, could you add that to svyquantile?

Fred

Thomas Lumley wrote:
On Mon, 12 Apr 2004, Fred Rohde wrote:

> Hello,
> Is there a way to get complex sample variances in the survey package on
> summary statistics other than means? If not, can they be added to a
> future version? It would be be great to have them on totals, quantiles,
> ratios, and tables (eg row percent, columns percent, etc).
>

svytotal() and svyratio() will do this for totals and ratios if you have a
new enough version. At the moment the easiest way to get row or column
percentages is to think of them them as ratios of means of binary
variables and use svyratio().

Quantiles are more difficult, since neither Taylor series nor jackknife
approaches work.

-thomas


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