Z:gnu-www-ja-frank--7be6fb-The pattern shown in Figure 9/en

The pattern shown in Figure 9 continues to hold when we control for the effects of other factors that influence defection rates. As the regression equation summarized in Table 3 shows, the defection probabilities do not differ significantly between upperclass economics majors and underclass economics majors. For nonmajors, defection probabilities are sharply lower than for majors in each category, and fall by more than 0.16 with the transition to upperclass status.