Appendix to Chapter 3

In order to compare single species and multispecies models we first estimate conditional and nested logit models for the shallow water grouper aggregate species (Table A3-1). In the single species models, the effect of the grouper catch on choice is about 25% lower in the nested logit model relative to the conditional logit. Willingness-to-pay values are significantly higher in the single species models.

Table A3-1. Single Species Random Utility Models

 

Conditional Logit

Nested Logit

 

Coeff.

t-stat

Coeff.

t-stat

Travcost

-0.04

-24.18

-0.11

-22.43

Grouper

11.10

20.07

5.78

6.00

Ln(Sites)

0.87

14.86

0.51

7.53

Inclusive value

 

 

0.12

12.37

Choices

30

30

Cases

725

725

Log-Likelihood

-1354

-1045

WTP

312.68

53.25