<p>In looking more closely at the data that I posted earlier from collegeboard.com and that which collegehelp generously posted from IPEDs, it appears that they may not always be counting the same groups of students, particularly for grad students (eg, I think that collegeboard.com might not be including law and grad business students). Following are the data from each institution and where there appear to be significant differences:</p>
<p>collegeboard.com , IPEDs , Difference , College</p>
<p>1646 , 13970 , 12324 , Johns Hopkins
10010 , 15370 , 5360 , Harvard
6712 , 11811 , 5099 , U Penn
5834 , 9486 , 3652 , U Chicago
4490 , 7295 , 2805 , Georgetown
13950 , 16660 , 2710 , USC
10285 , 12466 , 2181 , Stanford
8254 , 10428 , 2174 , U North Carolina
2977 , 4643 , 1666 , Tufts
4080 , 5692 , 1612 , Emory
5350 , 6890 , 1540 , Duke
7824 , 9325 , 1501 , Northwestern
7693 , 9140 , 1447 , U Virginia
4715 , 6027 , 1312 , Wash U
3925 , 5229 , 1304 , Vanderbilt
4852 , 6065 , 1213 , Yale
1393 , 2418 , 1025 , Wake Forest</p>
<p>17740 , 15525 , -2215 , Columbia
14526 , 12290 , -2236 , U Michigan</p>
<p>Notable Differences in Counting of Undergraduate Students </p>
<p>collegeboard.com , IPEDs , Difference , College</p>
<p>9750 , 6715 , -3035 , Harvard
11874 , 9730 , -2144 , U Penn
8639 , 5260 , -3379 , Columbia
9183 , 8153 , -1030 , Northwestern
5738 , 4478 , -1260 , Johns Hopkins</p>
<p>6313 , 8352 , 2039 , Notre Dame</p>