The coefficients on TC (however def

The coefficients on TC (however defined) are always negative and statistically significant beyond the 0.01 significance level. The negative coefficient on the income variable implies that the good (‘ visits to Dartmoor’) is inferior which, again, conforms to findings of studies at similar sites.
In the case of day visitors the estimated coefficients on the other independent variables corresponded in sign with those in counparable studies. The AGE coefficient was positive and significant, throughout as was positive and significant, indicating that longer periods of time spent on-site per visit were associated with more frequent visits. Both the constant and the a term were also significant throughout. Whether the respondent had visited EXMOOR (a proxy for the experience of a substitute) and whether DNP was the aim of the visit was never significant in the TNB regressions. As expected, removing the USE variable improved the significance parameter of these two coefficients but at a cost of a slightly worse fit. It is unsurprising (indeed it is almost true be construction) that heavy users of the park are those for whom DNP was the primary purpose of the trip.