Posts Tagged ‘Statistics’

Peer Assessments and the Great Divide

Tuesday, August 18th, 2009

Earlier this year, Paul Caron listed the peer assessment scores from the 2010 US News law school rankings. The rating scale runs from 1 (highest) to 5 (lowest). Here’s how the numbers fell out:

Average: 2.55

Percentiles
     25th between 1.9 (22nd) and 2.0 (30th)
     50th between 2.3 (47th) & 2.4 (55th)
     75th about 2.9

The distribution (with a normal reference curve) looks like this:

Distribution of 2010 US News Peer Asessments

Looking at the actual scores, the distribution is decidedly non-normal.  Of particular interest are the “fat tails”–the distributions of the top and bottom 25 percent, which are much larger than would be expected with a normal distribution.  The top 75% of law schools have peer assessments have a range of 1.5 points (1.4 to 1.9), while the for bottom 25%, peer assessments have a slightly larger range, 1.7 points (from 3.1 to 4.8).