Hello list,
This is a spatial statistics question! I have a point file composed of
randomly plotted points. There are 65 points in total. I need to calculate
the inter-event distance between these points. From what I understand, the
inter-event distance is the average distance of all the distances from any
one point to all the other points. If I have 65 points (n), we could say
that there are .5n(n-1) or .5X65 (65-1) = 2080 distances. Once I have this
number of distances, I am looking for a fast way to measure these 2080
distances. I have X, Y of the points so I could use the Pathagoras to
calculate the 2080 distances, but only one at a time. This seems too labor
intensive though.
Then I need to sum the distances, and finally divide the sum by 2080, in
order to give me an average inter-event distance. The order by which I
choose points is irrelevant - it's stochastic. Does any body know of a
quick way to calculate the 2080 distances if I know the X and Y of each
point? Again, the pathagoream theorem will work here, but I would have to
do the calculations one at a time. I have spoken to others about this, and
they suggested using Excel to calculate the function. Perhaps there is a
way in MapInfo though?
Many thanks,
Jon Spinney
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