“Tertius gaudens”: germplasm exchange networks and agroecological knowledge among home gardeners in the Iberian Peninsula

Table 4 Multivariate Poisson regression: agroecological knowledge and centrality in the network of germplasm exchange (n = 363)

	Agroecological knowledge
Explanatory variables:
Weighted degree (normalized)	0.004 (0.009)
Broker (normalized)	0.279*** (0.099)
Control variables:
Age	−0.005 (0.002)
Male	−0.084** (0.035)
Years gardening	0.007*** (0.001)
Network size	0.001 (0.010)
Schooling (ref. category no education)
Primary school	−0.001 (0.048)
More than primary but without university degree	−0.047 (0.057)
With university degree	−0.095 (0.092)
Residency duration (ref category, never lived)
Between 1 and 5 years	0.101 (0.146)
Between 5 and 10 years	0.240* (0.131)
More than10 years	0.275*** (0.093)
Always resident	0.320*** (0.093)
R ²	0.18

Note: For definition of variables see Table 1. Robust standard errors in parenthesis. *, **, and *** significant at the 10%, 5% and 1% level. Regressions contain a set of dummy variables for the network of data collection and a constant (not shown).

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