Exploring quality and its value in the Italian olive oil market: a panel data analysis

Carbone, Anna; Cacchiarelli, Luca; Sabbatini, Valentina

doi:10.1186/s40100-018-0102-8

Agricultural and Food Economics

Table 3 Results of regression models

From: Exploring quality and its value in the Italian olive oil market: a panel data analysis

		OLS models			Panel models
Quality clues	Variables	2012	2013	2014	OLS pooled	Random effects	Fixed effects
Product attributes	Bottle size 0.5 l	− 0.32***	− 0.32***	− 0.30***	− 0.31***	− 0.31***	− 0.32***
	Bottle size 0.75 l	− 0.35*	− 0.48***	− 0.36**	− 0.40***	− 0.37***	− 0.37***
	Local variety	− 0.12*	− 0.09	− 0.06	− 0.09***	− 0.05*	0.02
	Monovarietal	0.00	0.01	0.09	0.05	0.05	0.06
	Light fruity	− 0.21*	− 0.18*	− 0.18	− 0.18***	− 0.14*	0.01
	Medium fruity	− 0.08	− 0.09	− 0.02	− 0.06	− 0.06	0.01
Farm and production process attributes	Olive oil prod < 35 hl	0.13	0.24**	0.06	0.15**	0.14**	0.05**
	Olve oil prod 35–134 hl	0.19*	0.26**	0.11	0.20***	0.17***	0.09***
	Olive oil prod 135–235 hl	0.29*	0.26	0.01	0.17**	0.07	− 0.03
	Olive oil prod 236–335 hl	− 0.01	0.02	0.05	0.04	0.04	0.00
	Hand picking	0.18***	0.10*	0.12**	0.14***	0.14***	Omitted
	Farm olive oil mill	0.07	0.07	− 0.01	0.05	0.02	Omitted
	Cooperative	0.03	0.03	− 0.02	0.01	0.02	Omitted
	Purchased olives > 50%	0.01	− 0.06	− 0.07	− 0.03	− 0.03	− 0.08
	EVOO from organic farm	− 0.03	− 0.09	− 0.09	− 0.07**	− 0.02	0.02
	Ecosustainability award	− 0.02	0.02	0.07	0.03	0.03	0.06
	Farm ranking	0.02***	0.01**	0.02***	0.02***	0.02***	0.03***
Geographical origin attributes	North	0.76***	0.45*	0.55***	0.57***	0.56***	Omitted
	Center	0.24	0.12	0.26	0.20	0.24	Omitted
	geographical indications	0.02	0.09	0.07	0.07*	0.05	0.02
	Cons	1.56**	3.13***	3.07***	1.61***	1.55***	1.06
	Observations	235	269	256	757	757	757
	No. of groups					396	396
	R^2	0.37	0.32	0.38	0.34	0.33	0.14
	Adj R^2	0.32	0.26	0.33	0.32
	RootMSE	0.34	0.34	0.31	0.33
	R^2 within					0.16	0.18
	R^2 between					0.34	0.10
	Breusch-Pagan LM test					271.57***
	Hausman test RE vs FE						19.46

Source: our elaboration on FLOS OLEI (editions 2013, 2014, and 2015)
***Means significant at 1%; **means significant at 5%; *means significant at 10%

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