On May 11, 2009, at 9:46 AM, Ben Bolker wrote:
beetle2 wrote:
For a homework question.
I was wondering if rcmdr has a function to plot a graph of a
bivariate
function of X and Y.
I have a function with joint pdf
fX,Y(x,y) = x+y for 0<x<1 , 0<y<1
I've tried
x <- seq(0,1,.001)
y <- seq(0,1,.001)
r = x+y
plot(r)
but it seems to just add them together say .2+.2 .3+.3 not other
possibilities like
.9 + .1
We don't do homework questions here, but a few hints:
(1) the question doesn't seem to be fully specified. Are x and y
supposed
to be uniform?
(2) you could get a reasonable representation of the solution
(although
not necessarily one your prof would be happy with) by adding
runif(10000,0,1) and runif(10000,0,1)
(3) to do this analytically, think about convolutions and/or moment
generating functions.
(4) ?integrate
and search on "double integration".
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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