In order to compare the gravity models of trade and immigration, column two in
Table 2 presents the estimated coefficients for the gravity model of trade in equation
(3) using the immigration data. Column three of Table 2 reports the results from
estimating the gravity model of immigration specified in equation (6). The
similarities between the trade and immigration gravity models are clear. Most
variables are highly significant, and the adjusted R-square measure indicates that
the model performs well