HI all: Imagine I have a non sp object. How can I make a correlogram of data
z that are located by x and y? I'm finding the examples in spdep totally
opaque since I'm starting from coordinate data. Thanks in advance, DrC.

library(spdep)
x <- runif(100)
y <- runif(100)
z <- runif(100)
k1 <- knn2nb(knearneigh(cbind(x,y)))
m1 <- moran.test(z,nb2listw(k1))
sp.correlogram(k1, z, .........)

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