Table 8 Heckman sample selection model for soft drink expenditure per capita

Log of total household expenditure (PGK/capita/year)

0.676***

23.976***

12.477*

24.499***

19.539***

(0.077)

(3.123)

(7.112)

(7.247)

(2.429)

Household-level unit soft drink price (PGK/Liter)

−0.461***

4.036**

8.784***

0.583

−6.708***

(0.082)

(1.641)

(3.215)

(3.526)

(2.435)

Household-level unit soft drink price squared (PGK/kg)

0.024***

−0.066

−0.300*

0.124

0.405***

(0.004)

(0.092)

(0.166)

(0.182)

(0.128)

Euclidean distance to major market town^a (km)

−0.014**

− 0.243**

−0.299*

(0.007)

(0.121)

(0.167)

Euclidean distance to major market town squared (km²)

0.000

0.001

0.001

(0.000)

(0.001)

(0.001)

Household size

0.069**

−1.519*

−2.933**

−1.714

0.375

(0.033)

(0.907)

(1.228)

(1.358)

(0.801)

Household head completed primary education (0/1)

0.076

1.359

1.669

(0.124)

(2.208)

(2.742)

Household head completed lower secondary (0/1)

0.252*

4.475*

5.496

(0.140)

(2.490)

(3.356)

Household head is female

−0.166

−2.952

−3.625

(0.150)

(2.669)

(3.402)

Age of household head

−0.008*

0.129

0.285

0.138

−0.072

(0.004)

(0.162)

(0.190)

(0.205)

(0.115)

Number of children (0–15 yrs)

0.042

0.742

0.912

(0.041)

(0.722)

(0.916)

East Sepik Province (base = Bougainville)

−0.745***

−37.029***

−30.890***

−42.419***

−36.927***

(0.211)

(4.615)

(6.003)

(6.882)

(6.012)

Madang Province (base = Bougainville)

−1.136***

−37.869***

−15.326

−34.059**

− 38.482***

(0.339)

(6.205)

(14.040)

(15.290)

(7.700)

West Sepik Province (base = Bougainville)

−1.256***

−36.041***

−23.537***

−44.594***

−42.139***

(0.230)

(5.454)

(9.031)

(9.904)

(6.079)

Inverse Mills (Lambda)

−25.516*

(13.969)

Constant

−2.372***

− 133.379***

−52.404

(0.765)

(26.419)

(52.280)

N Observations

1023

412

1023

1023

1023