Q. How accurate is the data used on this site?
A. Somewhere between mostly and questionably accurate. Except where otherwise noted, is accurate as of 2012, with the exception of demographic data, which is from 2011, even when 2012 proficiency data is displayed because NCES hasn't released 2012 data yet. The sources for the data used are as follows:
Proficiency:
OSSE Demographic Information:
NCESData validity: Some OSSE data is suspect as it occasionally includes negative numbers of students in categories.