Table 3.

Summary of model definition, estimation and statistical comparison using parametric predictors

		Model 1	Model 2
	Model name	"overall distance"	"decade distance"
First level (coefficient estimation)	predictors	"overall distance" , "problem size"	"decade distance" , "problem size"
Second level Paired two-sample t-tests		"overall distance" > "decade distance"
		"overall distance" < "decade distance"
	Model name	"log-overall distance"	"overall distance"
First level (coefficient estimation)	predictors	"log overall distance", "problem size"	"overall distance", "problem size"
Second level Paired two-sample t-tests		"log-overall distance" > "overall distance"
		"log-overall distance" < "overall distance"