This is old info but im a new poster,so ill fill everyone in from what i can remember (its seems so long ago):

the combination of PNM numbers dropping off and there being 16 sororities make our quota low compared to other schools....

Purdue Uses the u of m method, which divides the # of PNM in the third round by the # of chapters, ensuring that everyone could have a bid somewhere.

Quota was 33.
KKG, APhi, and Phi Mu all got 34

AXO, XO, AGD, DG, Thetas, DZ, Tri-Delts, Pi Phi and ZTA all got quota @ 33

GPhiB, AZD, Sigma Kappa and AOPi did not get quota but i cant remember exactly how many girls they did end up getting. The deal with COBing @ Purdue is if the total chapter membership is below campus total then you can COB. Unfortunately the AOPi chapter is having to shut down and i believe there are plans to recolonize in a year. Hope i got mostly everything right here!