Table 4.

Estimating a model of preferential attachment dynamics

CoefficientEffectEstimateSEt Value
β1Di(t1)0.99672.4579 × 10e − 540,552.3543
β2Iafter(t)0.47693.1256 × 10e − 3152.5746
β3Iafter(t)Zi0.13565.4359 × 10e − 324.9362
β4Di(t1)×Iafter(t)−0.00271.7402 × 10e − 5−154.0051
β5Di(t1)×Zi0.00264.213 × 10e − 559.8139
β6Di(t1)×Iafter(t)×Zi−0.00144.213 × 10e − 5−43.0399
  • R2 = 0.9988, 64,957 students, and 13,577,088 effective observations (72). All reported coefficients are significant at P value < 2.2 × 10e − 16.