Second, adding the additional controls does not affect significantly the variance explained by the model.
Generally, the inclusion of individual controls does not significantly affect the estimates for any particular group of school characteristics.
First, adding more controls does not change dramatically the beta-coefficient (columns 1, 3 and 5), which remains between 0.60 and 0.65, close the baseline estimate of 0.61 from Table 1.
Our results conclude that a focus on employment levels is appropriate for this sector and, further, that the deployment of nonlinear trend controls does not dislodge prior research which finds weak support for the existence of adverse minimum-wage employment effects on employment.
The fact that BS and BSD show smaller variations in the adjusted index specifications only tells us that the amount of additional endogeneity induced by the absence of age controls does not add much to the endogeneity already present in these specifications.
In keeping with the findings from the GUI analysis the inclusion of these additional controls does not change the relative size of the bias from the CE approach; in the NHANES data the bias from the CE approach is of the order of 6% with or without the additional controls.
