The Effect of Learning and Fatigue on Preferences and WTP in a ...

Initially, four RPL models are estimated:
Model (i): based on the first 8 CS;
Model (ii): based on the last 8 CS;
Model (iii): based on all 16 CS, not accounting for potential difference in scale
between the first <strong>and</strong> last 8 CS;
Model (iv): based on all 16 CS, allowing <strong>and</strong> accounting for potential difference in
scale between the first <strong>and</strong> last 8 CS.
Table 2 displays the results obtained in the four different models.
Table 2: RPL models for the first 8 <strong>and</strong> the last 8 CS, <strong>and</strong> models for including all 16 CS both with
<strong>and</strong> without corrections for differences in scale.
Variable
Campylobacter-free label
Salmonella-free label
Domestic produce
Organic production
ASC (Status quo)
Price
St<strong>and</strong>ard Deviation
Campylobacter-free label
Model (i)
First 8 CS
Coefficients
(Std. Err.)
0.81
(0.0668)
0.62
(0.081)
1.192
(0.0992)
0.454
(0.0952)
0.142
(0.13)
-0.0375
(0.00267)
t-value
12.13
7.66
12.01
4.77
1.09
-14.07
Model (ii)
Last 8 CS
Coefficients
(Std. Err.)
0.916
(0.0886)
0.95
(0.1224)
1.338
(0.1604)
0.764
(0.1378)
0.32
(0.139)
-0.0441
(0.00368)
t-value
10.35
7.76
8.34
5.55
2.29
-11.96
Model (iii)
All 16 CS - not
corrected for scale
Coefficients
(Std. Err.) t-value
1.252
(0.103)
12.16
1.142
(0.1338)
8.55
1.906
(0.1778)
10.73
1.214
(0.1732)
7.01
-0.36
(0.165)
-2.18
-0.0549
(0.00394)
-13.92
Model (iv)
All 16 CS - corrected
for scale
Coefficients
(Std. Err.)
t-value
0.432
(0.0358)
12.05
0.396
(0.0458)
8.63
0.658
(0.0624)
10.52
0.422
(0.059)
7.13
-0.123
-2.12
(0.058)
-0.0189
(0.00135)
0.0746
0.22
1.174
0.406
0.35
0.76
8.72
(0.212)
(0.29)
(0.1346)
(0.046)
Salmonella-free label
0.54
0.84
1.552
0.534
-3.84
-4.29
-10.56
(0.1404)
(0.1962)
(0.1468)
(0.0506)
Domestic produce
0.676
1.038
1.736
0.598
-4.53
-5.9
-10.84
(0.1496)
(0.176)
(0.16)
(0.0556)
Organic production
1.046
1.236
2.38
0.818
5.42
-5.52
-9.36
(0.193)
(0.224)
(0.254)
(0.0874)
ASC (Status quo)
1.93
2.11
3.39
1.17
13.93
10.95
13.93
(0.138)
(0.193)
(0.243)
(0.0854)
Scale factor (first 8 CS = 1)
1.14
(0.0491)
LL -2534 -2415 -4304 -4300
Adj. Rho-square 0.256 0.291 0.369 0.369
-13.99
8.8
-10.54
-10.73
-9.37
13.65
2.85 a
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