Table 3.

Estimates of the proportion of variation explained by typical and alternative scoring algorithms in behavioral measures of impulsivity and substance use.

	Proportion of Variance Explained by:	Remaining Proportion of Variance Explained by:
Outcome	Typical Algorithm	Maximal Algorithm	WAIS Algorithm
	BIS-11
Behavioral Measures
EDT	.00 (.00)	.00 (.01)	.00 (.00)
BART	.01 (.00) ***	.02 (.00) ***	.00 (.00)
Past Six -Month Substance Use
Alcohol Quantity	.07 (.06)	.00 (.00)	.00 (.00)
Marijuana Quantity	.04 (.02) *	.00 (.00)	.00 (.00)
ZSS
Behavioral Measures
EDT	.01 (.00) *	.01 (.01)	.01 (.01)
BART	.01 (.01)	.00 (.00)	.02 (.01)
Past Six -Month Substance Use
Alcohol Quantity	.17 (.02) ***	.00 (.01)	.00 (.00)
Marijuana Quantity	.10 (.02) ***	.00 (.00)	.00 (.00)

Note.

^***p < .001,

^**p < .01,

^*p < .05.

Standard errors are listed in parentheses. Estimates listed as .00 are less than .01. Alcohol quantity was the total number of drinks in the last six months. Marijuana quantity was the total number of joints smoked in the last six months. Abbreviations: BART: Balloon Analog Risk Task; BIS-11: Barratt Impulsiveness Scale-Version 11; EDT: Experiential Discounting Task; ZSS: Zuckerman Sensation Seeking Scale