Andrew R. Morral

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Propensity score estimation with boosted regression for evaluating causal effects in observational studies.

Daniel F. McCaffrey, Greg Ridgeway, Andrew R. Morral
Psychological methods
2004

Causal effect modeling with naturalistic rather than experimental data is challenging. In observational studies participants in different treatment conditions may also differ on pretreatment… (More)

Influence of emotional engagement and habituation on exposure therapy for PTSD.

Lisa H Jaycox, Edna B Foa, Andrew R. Morral
Journal of consulting and clinical psychology
1998

This study examined 2 process variables, emotional engagement and habituation, and outcome of exposure therapy for posttraumatic stress disorder. Thirty-seven female assault victims received… (More)

Reassessing the marijuana gateway effect.

Andrew R. Morral, Daniel F. McCaffrey, Susan M. Paddock
Addiction
2002

AIMS Strong associations between marijuana use and initiation of hard drugs are cited in support of the claim that marijuana use per se increases youths' risk of initiating hard drugs (the 'marijuana… (More)

Shaping reduced smoking in smokers without cessation plans.

Richard J Lamb, Andrew R. Morral, Greg Galbicka, Kimberly C Kirby, Martin Y Iguchi
Experimental and clinical psychopharmacology
2005

Most smokers do not plan to quit in the next 6 months. The authors previously demonstrated that percentile schedules shape lower breath carbon monoxide (BCO) levels in smokers trying to quit (R. J.… (More)

A decade of drug treatment court research.

Susan Turner, Douglas L. Longshore, +9 authors Duane McBride
Substance use & misuse
2002

As drug treatment courts have multiplied over the past decade, so too have research evaluations conducted on their implementation and effectiveness. This article explores the decade of drug treatment… (More)

Toolkit for Weighting and Analysis of Nonequivalent Groups: A tutorial for the twang package

Greg Ridgeway, Dan McCaffrey, Andrew R. Morral, Lane F Burgette, Beth Ann Griffin
2015

The Toolkit for Weighting and Analysis of Nonequivalent Groups, twang, contains a set of functions and procedures to support causal modeling of observational data through the estimation and… (More)

Reinforcing Operants Other Than Abstinence in Drug Abuse Treatment

Martin Y Iguchi, Mark A. Belding, Andrew R. Morral, Richard J Lamb, Stephen D. Husband
Journal of consulting and clinical psychology
1997

This study examines the effectiveness of using vouchers to reinforce either the provision of urine samples testing negative for illicit drugs (UA group) or the completion of objective, individually… (More)

The longitudinal association between substance use and delinquency among high-risk youth.

Elizabeth J. D'Amico, Maria Edelen, Jeremy N. V. Miles, Andrew R. Morral
Drug and alcohol dependence
2008

Over the past two decades, studies have provided evidence for the strong link between substance use (SU) and delinquency among adolescents. However, the dynamics of this relationship and its temporal… (More)

Improving contingency management programs for addiction.

Richard J Lamb, Kimberly C Kirby, Andrew R. Morral, Greg Galbicka, Martin Y Iguchi
Addictive behaviors
2004

Contingency management interventions effectively reduce or eliminate some individuals' problem substance use. Typically, those who do not benefit never experience the reward or planned contingency… (More)

Predicting DUI recidivism: Personality, attitudinal, and behavioral risk factors.

Terry L Schell, Kitty S Chan, Andrew R. Morral
Drug and alcohol dependence
2006

AIMS To predict DUI recidivism using personality, attitudinal, and behavioral factors. DESIGN We conducted cross-sectional analyses of survey data. Covariance structure modeling was used to… (More)

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