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. Author manuscript; available in PMC: 2015 Sep 2.
Published in final edited form as: Assess Eff Interv. 2011 Feb 2;36(3):158–166. doi: 10.1177/1534508410396698

Table 2.

Base Rate Comparison for Sample-Based Indices: State Achievement Test

Screen Fail Pass Total
School A
  At risk 950 100 1,050
  Not at risk 50 900 950
  Total 1,000 1,000 2,000
School B
  At risk 285 170 455
  Not at risk 15 1,530 1,545
  Total 300 1,700 2,000