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mar_stat
2005 Oct 21
0
using markstat
Dear all,
I am using the spatstat package, and in particular the algorithm
markstat(X,fun,N,R,.)
I need that output to detect which is the nearest neighbour of each point in
that point pattern.
Therefore, I would use
X=my ppp object already defined,
N=2
But what function should I use? It should be something like "none"..?!
Hope you can help me on this.
Regards,
Sar...
2006 May 03
1
Permutation test of marked point pattern
...ues smaller than the observed mean value occur
less than 5% of the time. I suppose 1000 permutations would be a
reasonable starting point (the ppp object has 27 points).
so far, I've figured out how to:
-create a marked ppp object: ms.ppp
-calculate my test statistic:
teststat <- mean(abs(markstat(ms.ppp, diff, N=2)))
-randomly allocate marks to a point pattern:
Y <- rlabel (ms.ppp, labels=ms.ppp$marks, permute=TRUE)
I have looked at perm.test{exactRankTests} and perused the R help
archive but haven't been able to find how to work the permutation test
with a marked ppp object.
I t...