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This paper is concerned with the problems of interaction screening and nonlinear classification in a high-dimensional setting. We propose a two-step procedure, IIS-SQDA, where in the first step an innovated interaction screening (IIS) approach based on transforming the original p-dimensional feature vector is proposed, and in the second step a sparse(More)
BACKGROUND Although rates of illicit drug use are considerably lower in Mexico than in the United States, rates in Mexico have risen significantly. This increase has particular implications for Mexican women and US migrants, who are considered at increased risk of drug use. Due to drug reforms enacted in Mexico in 2008, it is critical to evaluate patterns(More)
RATIONALE Research is limited on the extent to which implementation of evidence-based and culturally responsive practices reduces outcome disparities in substance use disorder treatment. We examined the role of contingency management treatment (CMT), medication-assisted treatment (MAT), and culturally competent practices on Mexican Americans' rate of(More)
BACKGROUND We examined Mexican migrants' perceived barriers to entering substance abuse treatment and potential differences by gender. METHODS This study analyzed a subset of household data collected in Mexico in 2011 via the Encuesta Nacional de Adicciones (National Survey of Addictions). A sample of 1,143 individuals who reported using illicit drugs was(More)
Feature interactions can contribute to a large proportion of variation in many prediction models. In the era of big data, the coexistence of high dimensionality in both responses and covariates poses unprecedented challenges in identifying important interactions. In this paper, we suggest a two-stage interaction identification method, called the interaction(More)
BACKGROUND HIV testing and receipt of HIV test results among individuals with substance use disorders is less than optimal. We examined rates and correlates of HIV testing and receipt of test results in one of the largest public addiction health services systems in the United States. METHODS The study included 139,516 adult clients in treatment between(More)
This study investigated the association between program cultural competence and homeless individuals' drug use after treatment in Los Angeles County, California. Los Angeles County has the largest and most diverse population of homeless individuals in the nation. We randomly selected for analysis 52 drug-treatment programs and 2158 participants who(More)
Using a random sample of 48 outpatient mental health programs in low-income and racial and ethnic minority communities, this study examined directorial leadership, drug treatment licensure, and implementation of evidence-based protocols and practices to address co-occurring mental health and substance abuse disorders (COD). Understanding of findings was(More)
Quality of care, such as provision of services in Spanish, is a common factor believed to improve treatment engagement among Spanish-speaking Latinos in health care. However, there is little evidence that Spanish language proficiency among providers increases treatment access and retention in publicly funded substance abuse treatment. We analyzed client and(More)
BACKGROUND Leadership style and specific organizational climates have emerged as critical mechanisms to implement targeted practices in organizations. Drawing from relevant theories, we propose that climate for implementation of cultural competence reflects how transformational leadership may enhance the organizational implementation of culturally(More)