How best to model these datasets

This list is for questions about R (see the Posting Guide), yet this is a question about statistics. You might consider paying at CrossValidated, but I would suggest not being quite so vague.
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Sent from my phone. Please excuse my brevity.

Hello,

I am a stats novice and I was wondering what kind of model would work
best
with the two datasets that are displayed.  The graphs show an
incremental
area analysis for two feral cat home ranges where area increases with
increasing number of GPS fixes.

Thanks,

Brian