Dear all,

Please, look at the following code:

attach(geyser)
f1 <- kde2d(duration, waiting, n = 5)

a <- 0
for (i in 1:5){
 for (j in 1:5){
 a <- a + f1$z[i,j]
 }
}

As far as I understood from Help kde2d returns matrix elements of which are
values of joint probability mass function Pr(X=x,Y=y) therefore, sum of its
elements should sum to 1.
Which is not the case from my check.
Where is the problem here?

Thanks a lot.

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