I'm trying to identify patterns among various "paths" like the following:

http://i.imgur.com/bQPI3.png

If I plot these, I can observe intuitively two different patterns: a front
loaded (1 and 3) and a backloaded (2,4) progress path:

http://i.imgur.com/L5qwZ.png

I have thousands of observations like the above table, and I want to use R
to identify clusters of these paths.  I looked at spatstat, but it seems
more relevant to points than paths.

Thanks,
bp

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