No Primary Index - skewing

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No Primary Index - skewing

Hi,  I have a table with approx 65,000 rows in, which I have defined as having "NO PRIMARY INDEX".  As far as I understood, such tables shouldn't skew, but I am calculating the skew at 86.91%.  The skew calculation I'm using is one I got from these forums which is roughly defined as avg(currentperm)/max(currentperm) * 100.  Is it possible for tables with no primary index to skew then?