demographic variations that may be present among subpopulations due to factors such as differential dropout rates (e.g., there are fewer C, D, and F students than A and B students in upper grades because students with poor academic performance drop out at higher rates), and produces composite estimates that are directly comparable among subpopulations. Endnotes Since the school survey only samples in-school students, it is likely that the 1 study underestimates the prevalence of substance use in the adolescent popula- tion because school dropouts consistently have shown higher rates of substance use than those staying in school. See G. Globetti, “Teenage in Alcoholism: Development, Consequences, and Interventions, Drinking,” 2nd ed., N. J. Estes and M. E. Heinemann eds. (St. Louis, Mo.: The C. V. Mosby Co., 1982); W. B. Hansen, L. M. Collins, C. K. Malotte, C. A. Johnson, and J. E. in Prevention Journal of Fielding, “Attrition Research,” 8:3 (1985): Behavioral Medicine 261-275; L. Y. Liu, Substance Use Among Youths at High Risk of Dropping Out: (Austin, Tx.: Texas Commission on Alcohol and Grades 7-12 in Texas, 1992 Drug Abuse, August 1994). J. A. Dyer, R. Prislin, L. Ringer, and C. D. Hanks, Methodology Report 2 for the (College Station, Tx.: Public 1994 Texas School Survey of Drug and Alcohol Use Policy Research Institute, Texas A& M University, 1994).
demographic variations that may be present among subpopulations due to factors such as differential dropout rates (e.g., there are fewer C, D, and F students than A and B students in upper grades because students with poor academic performance drop out at higher rates), and produces composite estimates that are directly comparable among subpopulations. Endnotes 1 Since the school survey only samples in-school students, it is likely that the study underestimates the prevalence of substance use in the adolescent popula- tion because school dropouts consistently have shown higher rates of substance use than those staying in school. See G. Globetti, “Teenage Drinking,” in Alcoholism: Development, Consequences, and Interventions, 2nd ed., N. J. Estes and M. E. Heinemann eds. (St. Louis, Mo.: The C. V. Mosby Co., 1982); W. B. Hansen, L. M. Collins, C. K. Malotte, C. A. Johnson, and J. E. Fielding, “Attrition in Prevention Research,” Journal of Behavioral Medicine 8:3 (1985): 261-275; L. Y. Liu, Substance Use Among Youths at High Risk of Dropping Out: Grades 7-12 in Texas, 1992 (Austin, Tx.: Texas Commission on Alcohol and Drug Abuse, August 1994). 2 J. A. Dyer, R. Prislin, L. Ringer, and C. D. Hanks, Methodology Report for the 1994 Texas School Survey of Drug and Alcohol Use (College Station, Tx.: Public Policy Research Institute, Texas A& M University, 1994).
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