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Table 6 OLS regression of attributes affecting willingness to pay for digestate

From: Factors affecting purchasing process of digestate: evidence from an economic experiment on Sicilian farmers’ willingness to pay

Attributes included in the models T1 T2 T3 T4a T4b
Const. 11.774 (0.0001) *** 9.4533 (0.0001) *** 2.8795 (0.0001) *** 3.9313 (0.0002) *** 13.417 (0.0000) ***
Organic origin 0.4975 (0.4212) 0.3214 (0.7042) − 0.1993 (0.5890) − 0.2564 (0.6120) − 2.6421 (0.0084) ***
Soil fertility 0.9465 (0.3159) − 0.2672 (0.6540) 0.3260 (0.2872) − 0.1544 (0.7044) − 2.2206 (0.0001) ***
Environmental sustainability − 0.4454 (0.6843) − 1.2449 (0.1311) − 0.4731 (0.0629) * − 0.57858 (0.1294) − 2.1899 (0.0002) ***
Safety − 1.8563 (0.0859) * − 2.8498 (0.0016) *** − 0.6556 (0.2117) − 0.4310 (0.3795) − 3.1472 (0.0023) ***
Price − 0.5677 (0.4405) − 0.2078 (0.7163) − 0.7885 (0.0015) *** − 0.5360 (0.2100) − 1.8548 (0.0046) ***
Natural product 0.3112 (0.7855) 3.1440 (0.0028) *** 0.4772 (0.3047) 1.1918 (0.0289) ** − 0.3263 (0.7267)
Microbial activity 0.1671 (0.8206) − 0.7236 (0.0894) * 0.2637 (0.5272) − 0.0036 (0.9878) − 1.0926 (0.0170) **
  R2 = 0.23 R2 = 0.75 R2 = 0.37 R2 = 0.30 R2 = 0.40
  Adjusted R2 = 0.12 Adjusted R2 = 0.72 Adjusted R2 = 0.27 Adjusted R2 = 0.20 Adjusted R2 = 0.31
  1. Values in the brackets are p values: *10%; **5%; ***1%