The local variability of rainfall and tribal institutions: the case of Sudan

Tribal societies in Sudan that experience more local spatial rainfall variability will be less likely to have centralized hierarchical institutions.

Test
Test Name	Support	Significance	Coefficient	Tail
Two Step Least Squares Regression	Mostly Supported	5 of 8 variables in predicted direction	R^2=0.502	`UNKNOWN`

Variables
Variable Name	Variable Type	OCM Term(s)
Population Density	Independent	Population
Rainfall Variation	Independent	Climate
% rural economic activity in agriculture	Independent	Tillage
Centralization	Dependent	Territorial Hierarchy
Openness of property	Independent	Property System
Rain seasonality	Independent	Climate
Rainfall distribution	Independent	Climate
River proximity	Independent	Maps, Topography And Geology

Main Author	Published Year	Hypothesis	Supported	Variables Tested
Nugent, Jeffrey B.	1999	Tribal societies in Sudan that experience more local spatial rainfall variability will be more likely to establish more common property rights.	Supported	7	Cite Related Hypotheses More By Author
Ahmed, Ali T.	2020	Local and central councils serve as alternatives to one another in dealing with informational asymmetries.	Supported	3	Cite Related Hypotheses More By Author
Giuliano, Paola	2013	Traditions of local democracy will be positively associated with more democratic national institutions (86).	Supported	2	Cite Related Hypotheses More By Author
Hobhouse, L. T.	1915	"Among the [lower economic types] the number of cases in which tribal offenses alone are publicly punished is overwhelmingly greater than the number in which private offenses alone are so punished, while in the higher [economic] grades the relation is reversed" (79)	Supported	2	Cite Related Hypotheses More By Author
Precourt, Walter	1975	"Initiation ceremonies will exist at the tribal level of socio-cultural complexity while secret societies will exist in chiefdoms" (239)	Supported	3	Cite Related Hypotheses More By Author