On Fri, 20 Apr 2001, Jon McAuliffe wrote:
>
> suppose i have an nx2 matrix A; call its column vectors
> x and y. the rows of A are grouped by a factor F. i want to fit
> one lowess curve (y vs. x) for each subset of rows corresponding
> to a particular level of F. naively, i mean something like
>
> tapply(A, F, fun = lowess) ,
>
> but tapply needs A to be 1-dimensional. reading the help pages,
> the other {,l,s}apply functions seem not to be germane in this
> situation either. what's the correct approach here?
by()
-thomas
Thomas Lumley Asst. Professor, Biostatistics
tlumley at u.washington.edu University of Washington, Seattle
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._