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. Author manuscript; available in PMC: 2010 Mar 4.
Published in final edited form as: Econ Dev Cult Change. 2009 Apr;57(3):439–477. doi: 10.1086/596614

Table 8c.

Estimated impacts on grade of schooling: Nearest-neighbor matching ° T1999 vs. C2003 Difference-in-difference matching using children of same age pre-program

Age
in
2003		 Pre-
program
difference		 After-
program-
initiation
difference		 Impact:
Difference-
in-
difference
matching		 C2003 grades
of schooling, %
impact
Girls
6-8 −0.19
(0.022)		 −0.033
(0.122 )		 0.15
(0.13)		 1.42, 10.2%
9-11 −0.32
(0.056)		 −0.071
(0.070)		 0.25
(0.09)		 3.33, 7.5%
12-14 −0.31
(0.107)		 0.09
(0.10)		 0.40
(0.16)		 5.64, 7.1%
6-14 −0.27
(0.038)		 −0.10
(0.06)		 0.17
(0.07)		 3.44, 5.0%
Boys
6-8 −0.20
(0.022)		 −0.17
(0.103)		 0.038
(0.11)		 1.10, 2.7%
9-11 −0.42
(0.056)		 −0.024
(.079)		 0.40
(0.10)		 3.18, 11.9%
12-14 −0.21
(0.107)		 0.07
(0.104)		 0.28
(0.16)		 5.49, 4.9%
6-14 −0.28
(0.04)		 −0.035
(0.076)		 0.25
(0.09)		 3.32, 7.7%
°

Difference-in-difference estimator, imposing common support (trimming=2%), 3 neighbors. Standard errors (parentheses) based on Abadie and Imbens, 2002.