Hi--

I have had a student come in with a sampling problem I don't know how to resolve.
The student is interested in determining the distribution of sizes of pores in a particular
material.  He is looking at samples under high magnification and measuring pore
sizes (diameter of two-dimensional disks on the sample surface).  These samples
are large, the pores are irregularly arrange, and it is not possible to sample all of the holes
in any given sample to determine the distribution of diameters.
The question is how to choose a random sample
of pores to measure that does not bias towards either large or small holes.  I haven't
been able to come up with any good plan.

I am grateful for any suggestions!

Thanks,
Eugenie

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