130
Table 7.4 Impact of the Managerial Skill Training on Business Performance in Suame Magazine: Difference-in-Difference Random-Effect and Fixed-Effect Models (Treatment-Received Analysis) (continued) Dependent variable b: Fixed-effect IV model Participant × manufacturer × year 2008 Participant × machinist × year 2008 Hausman test χ2 (p value)
Sales revenue
Value added
Gross profit
Visiting customers
Keeping records
Analyzing records
25.34* (1.76) –7.054 (–0.25) †
18.05** (2.16) 6.42 (0.30) 0.42
15.05** (1.99) 1.974 (0.10) 0.35
0.222** (2.01) 0.268*** (2.93) †
0.593*** (4.49) 0.182** (2.43) 5.69
0.482*** (4.68) 0.290*** (3.21) 1.12
(1.000)
(1.000)
(0.682)
(0.997)
Source: Mano and others 2010. Note: The number of observations is 429. Panel a reports all the estimates of the coefficients of the random-effect model. The interactions between the dummy for machinist and the year dummies (2002, 2004, and 2008) are included in the estimation, but are not reported. Panel b highlights the DID estimate of the treatment effect. t-statistics based on robust standard errors are in parentheses. *** p < 0.01. ** p <0.05. * p <0.10. † Model fitted on the data fails to meet the asymptotic assumptions of the Hausman specification test.