## File: xy.group.Rd

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hmisc 4.2-0-1
 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051 \name{xy.group} \alias{xy.group} \title{ Mean x vs. function of y in groups of x } \description{ Compute mean x vs. a function of y (e.g. median) by quantile groups of x or by x grouped to have a given average number of observations. Deletes NAs in x and y before doing computations. } \usage{ xy.group(x, y, m=150, g, fun=mean, result="list") } \arguments{ \item{x}{ a vector, may contain NAs } \item{y}{ a vector of same length as x, may contain NAs } \item{m}{ number of observations per group } \item{g}{ number of quantile groups } \item{fun}{ function of y such as median or mean (the default) } \item{result}{ "list" (the default), or "matrix" }} \value{ if result="list", a list with components x and y suitable for plotting. if result="matrix", matrix with rows corresponding to x-groups and columns named n, x, and y. } \seealso{ \code{\link{cut2}}, \code{\link{tapply}} } \examples{ # plot(xy.group(x, y, g=10)) #Plot mean y by deciles of x # xy.group(x, y, m=100, result="matrix") #Print table, 100 obs/group } \keyword{category} \keyword{nonparametric} \concept{grouping} \concept{stratification} \concept{aggregation} \concept{discretization}