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dudi
2007 Oct 16
2
Canberra distance
Hi,
I misunderstand the definition of Canberra distance in R.
On Internet and in function description pages of dist() from stats and
Dist() from amap, Canberra distance between vectors x and y, d(x,y), is :
d(x,y) = sum(abs(x-y)/(x+y))
But in use, through simple examples, we find that the formula is :
d(x,y) = (NZ + 1)/NZ * sum(abs(x-y)/(x+y))
with NZ = nb of pairs of coordinates that are