Table 3: (a) Correlation matrix of the explanatory variables (minimum comparable areas, MCAs). (b) Correlation matrix of the explanatory variables (micro-regions). (c) Correlation matrix of the explanatory variables (meso-regions). (d) Correlation matrix of the explanatory variables (states).
(a)

Explanatory variables12345

1ln (income per capita) 1 0.18 0.68 0.22 −0.69
2( ) 0.18 1 0.08 0.07 −0.05
3ln (average years of schooling) 0.68 0.08 1 0.21 −0.54
4ln (population density) 0.22 0.07 0.21 1 −0.30
5ln (transportation cost to SP)−0.69−0.05−0.54−0.30 1

Note: own elaboration. Number of observations = 10,971.
(b)

Explanatory variables12345

1ln (income per capita) 1 0.16 0.85 0.26 −0.67
2 ( ) 0.16 1 0.06 −0.21 0.07
3ln (average years of schooling) 0.85 0.06 1 0.34 −0.63
4ln (population density) 0.26 −0.21 0.34 1 −0.47
5ln (transportation cost to SP)−0.67 0.07 −0.63−0.47 1

Note: own elaboration. Number of observations = 1,566.
(c)

Explanatory variables12345

1ln (income per capita) 1 0.13 0.87 0.29 −0.62
2( ) 0.13 1 0.02 −0.37 0.24
3ln (average years of schooling) 0.87 0.02 1 0.38 −0.59
4ln (population density) 0.29 −0.37 0.38 1 −0.54
5ln (transportation cost to SP)−0.62 0.24 −0.59−0.54 1

Note: own elaboration. Number of observations = 402.
(d)

Explanatory variables12345

1ln (income per capita) 1 0.03 0.88 0.21 −0.55
2 ( ) 0.03 1 −0.10−0.60 0.44
3ln (average years of schooling) 0.88 −0.10 1 0.27 −0.52
4ln (population density) 0.21 −0.60 0.27 1 −0.69
5ln (transportation cost to SP)−0.55 0.44 −0.52−0.69 1

Note: own elaboration. Number of observations = 81.