Wisconsin Center for the Advancement of Post-Secondary Education (2.6MB PDF):

To answer the guiding research questions, we developed a comparison group of academically and demographically similar non-participants to compare outcomes with AVID/TOPS students based on 8th grade pre-participation data. Using a statistical matching method called propensity score matching, we matched every AVID/TOPS student with a similar non-AVID/TOPS student at the same high school to create the comparison group.
Using these groups, we test for statistically and practically significant differences on key measures of academic preparation (cumulative GPA, enrollment and GPA in core courses, enrollment and GPA in AP/Honors courses, and credit attainment), college knowledge (test-taking rates and performance on the EXPLORE, PLAN, and ACT tests), and student engagement (attendance rates and behavioral referrals).
Statistically significant differences are differences that are unlikely to have occurred through random chance and are large enough to reflect meaningful differences in practice. In this report, we highlight statistically significant differences with a red symbol: .To focus attention on underrepresented students’ achievement, we disaggregated the measures by income and race. Though we report disaggregated findings, many of these groups are not mutually exclusive; for example, low-income students may also be African-American and therefore also represented in that data disaggregation. We do not report data from disaggregated groups that have fewer than five students in them. We then analyze this data at the program, grade cohort, and high school levels.
This assessment does not make causal claims about AVID/TOPS, nor does it present a longitudinal analysis of AVID/TOPS student achievement. Rather, the findings represent a single snapshot for achievement during the 2011-12 school year of the program’s 9th, 10th, and 11th graders.