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
x
a vector, may contain NAs
y
a vector of same length as x, may contain NAs
m
number of observations per group
g
number of quantile groups
fun
function of y such as median or mean (the default)
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.