highly significantp < 0.001
The first-stage regression demonstrates that the instrument is a powerful predictor of Internet usage, with a highly significant coefficient ( p < 0.001).
The first-stage regression demonstrates that the instrument is a powerful predictor of Internet usage, with a highly significant coefficient ( p < 0.001).
A positive effect was also observed at a marginal significance level in the “equal subjective age” group ( p < 0.1, Model 2).