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Table 8 Results of sensitivity analysis (Sobol’s indexes)

From: The approaches to measuring the potential spatial access to urban health services revisited: distance types and aggregation-error issues

Transformation Z-score 0–1 Ranks
First order sensitivity index
 Distance type (n = 6) 3.34 6.05 3.12
 Aggregation method (n = 4) 0.01 0.10 0.83
 Accessibility measure (n = 14) 86.00 79.91 74.17
Second order sensitivity index (interaction)
 Distance type versus aggregation method 0.02 0.01 0.24
 Distance type versus accessibility measure 10.19 13.52 19.76
 Aggregation method versus accessibility measure 0.15 0.31 1.33
Total explained variance 99.71 99.89 99.44
Total sensitivity index
 Distance type 13.55 19.58 23.12
 Aggregation method 0.18 0.41 2.40
 Accessibility measure 96.34 93.73 95.25