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Author: Collins, Linda M.

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1.	Collins, Linda M. Sayer, Aline G.
1.	New Methods for the Analysis Of Change Decade of Behavior Series. Washington, DC: American Psychological Association, 2001 Cohort(s): NLSY79, Young Men, Young Women Publisher: American Psychological Association (APA) Keyword(s): Data Analysis; Data Quality/Consistency; Modeling; Modeling, Multilevel This volume presents state-of-the-art methods explored by recognized authorities on the analysis of change. Chapters highlight methods for estimating and evaluating models of growth and change over time at the level of the individual; address issues of measurement that are important in the analysis of change; point out methods for separating intra-individual growth from some aspects of phenomena that are stable over time; identify larger frameworks to integrate knowledge; and provide methods for dealing with missing data. This volume of methodological advances will influence a variety of disciplines from psychology and sociology to education and economics. (PsycINFO Database Record (c) 2000 APA, all rights reserved).
	Bibliography Citation Collins, Linda M. and Aline G. Sayer. New Methods for the Analysis Of Change. Decade of Behavior Series. Washington, DC: American Psychological Association, 2001.

2.	Kam, Chi-Ming Collins, Linda M.
2.	Latent Transition Analysis of Substance Use Among Adolescents in the National Longitudinal Survey Technical Report Series No 0037. University Park, PA: The Methodology Center, The Pennsylvania State University, 2000. Also: http://methcenter.psu.edu/pubs/00-37.pdf Cohort(s): Children of the NLSY79 Publisher: Methodology Center, The Pennsylvania State University Keyword(s): Alcohol Use; Behavioral Problems; Child Self-Administered Supplement (CSAS); Cigarette Use (see Smoking); Gender Differences; Modeling; Substance Use Permission to reprint the abstract has not been received from the publisher. The present study examines gender differences in substance use onset among 886 adolescents surveyed in the National Longitudinal Survey of Youth (NLSY). Three waves of data on adolescent substance use were analyzed using Latent Transition Analysis (LTA). To test the gateway hypothesis of substance use (Kandel & Yamaguchi, 1993; Collins, 1998a), transition probabilities of adolescent exposure to three substances, alcohol, cigarettes and marijuana, were estimated. In addition, a strategy similar to that employed by Collins, Graham, Long and Hansen (1994) was used to test gender differences in substance use onset among the NLSY adolescents. Nested models with different degrees of parameter restrictions were fitted to the data. First, a model that represents gender differences in all three sets of parameters (Big Rho's, Delta's, & Tau's) was fitted. Other models that constrained some of these parameters to be equal between gender were fitted subsequently. Model fit statistics were compared among models and the best fitting one was selected for interpretation. The results suggested that the model that represented no gender differences in all three parameter sets fit the data best. This suggests there are no gender differences in the types of substance use patterns (number and types of latent statuses), the proportion of adolescents falling into each latent status and the transition pattern of substance use. In addition, the study supports the gateway hypothesis that cigarette and alcohol usage are precursors to the use of marijuana. Due to the high percentage of non-response to substance use items in the survey as well as the weak measure of marijuana use, the present findings have to be interpreted with caution.
	Bibliography Citation Kam, Chi-Ming and Linda M. Collins. Latent Transition Analysis of Substance Use Among Adolescents in the National Longitudinal Survey. Technical Report Series No 0037. University Park, PA: The Methodology Center, The Pennsylvania State University, 2000..

3.	Kam, Chi-Ming Collins, Linda M.
3.	Latent Transition Analysis of Substance Use Among Adolescents in the National Longitudinal Survey of Youth Presented: Beijing, China, XVI Biennial Meetings of the International Society for the Study of Behavioral Development, June 2000 Cohort(s): Children of the NLSY79 Publisher: Methodology Center, The Pennsylvania State University Keyword(s): Modeling, Growth Curve/Latent Trajectory Analysis; Modeling, Multilevel; Substance Use Permission to reprint the abstract has not been received from the publisher. Poster to be presented at the XVI Biennial Meetings of the International Society for the Study of Behavioral Development (ISSBD 2000), Beijing, China. See also: http://methcenter.psu.edu/publications/00-37.pdf for abstract summary.
	Bibliography Citation Kam, Chi-Ming and Linda M. Collins. "Latent Transition Analysis of Substance Use Among Adolescents in the National Longitudinal Survey of Youth." Presented: Beijing, China, XVI Biennial Meetings of the International Society for the Study of Behavioral Development, June 2000.

4.	Kam, Chi-Ming Collins, Linda M.
4.	Latent Transition Analysis of Substance Use Among Adolescents in the National Longitudinal Survey of Youth Presented: New Orleans, LA, Society for Prevention Research Meetings, June 1999 Cohort(s): Children of the NLSY79 Publisher: Society for Prevention Research Keyword(s): Adolescent Behavior; Modeling, Growth Curve/Latent Trajectory Analysis; Modeling, Multilevel; Substance Use Permission to reprint the abstract has not been received from the publisher. Poster presented at the Society for Prevention Research meetings, New Orleans, LA. See also: http://methcenter.psu.edu/publications/00-37.pdf for abstract summary.
	Bibliography Citation Kam, Chi-Ming and Linda M. Collins. "Latent Transition Analysis of Substance Use Among Adolescents in the National Longitudinal Survey of Youth." Presented: New Orleans, LA, Society for Prevention Research Meetings, June 1999.

5.	Lanza, Stephanie T. Collins, Linda M.
5.	A Mixture Model of Discontinuous Development in Heavy Drinking From Ages 18 to 30: The Role of College Enrollment Journal of Studies on Alcohol 67,4 (July 2006): 552-561. Also: http://www.jsad.com/jsad/article/A_Mixture_Model_of_Discontinuous_Development_in_Heavy_Drinking_From_Ages_18/878.html Cohort(s): NLSY79 Publisher: Center of Alcohol Studies, Rutgers University Keyword(s): Addiction; Alcohol Use; College Enrollment; High School Students Permission to reprint the abstract has not been received from the publisher. Objective: The purpose of this study was to illustrate the use of latent class analysis to examine change in behavior over time. Patterns of heavy drinking from ages 18 to 30 were explored in a national sample; the relationship between college enrollment and pathways of heavy drinking, particularly those leading to adult heavy drinking, was explored. Method: Latent class analysis for repeated measures is used to estimate common pathways through a stage-sequential process. Common patterns of development in a categorical variable (presence or absence of heavy drinking) are estimated and college enrollment is a grouping variable. Data were from the National Longitudinal Survey of Youth (N = 1,265). Results: Eight patterns of heavy drinking were identified: no heavy drinking (53.7%); young adulthood only (3.7%); young adulthood and adulthood (3.7%); college age only (2.6%); college age, young adulthood, and adulthood (8.7%); high school and college age (4.4%); high school, college age, and young adulthood (6.3%); and persistent heavy drinking (16.9%). Conclusions: We found no evidence that prevalence of heavy drinking for those enrolled in college exceeds the prevalence for those not enrolled at any of the four developmental periods studied. In fact, there is some evidence that being enrolled in college appears to be a protective factor for young adult and adult heavy drinking. College-enrolled individuals more often show a pattern characterized by heavy drinking during college ages only, with no heavy drinking prior to and after the college years, whereas nonenrolled individuals not drinking heavily during high school or college ages are at increased risk for adult heavy drinking. [ABSTRACT FROM AUTHOR]
	Bibliography Citation Lanza, Stephanie T. and Linda M. Collins. "A Mixture Model of Discontinuous Development in Heavy Drinking From Ages 18 to 30: The Role of College Enrollment ." Journal of Studies on Alcohol 67,4 (July 2006): 552-561.

6.	Lanza, Stephanie T. Collins, Linda M.
6.	A New SAS Procedure for Latent Transition Analysis: Transitions in Dating and Sexual Risk Behavior Developmental Psychology 44,2 (March 2008): 446-456. Also: http://psycnet.apa.org/journals/dev/44/2/446/ Cohort(s): NLSY97 Publisher: American Psychological Association (APA) Keyword(s): Adolescent Sexual Activity; Alcohol Use; Dating; Modeling, Growth Curve/Latent Trajectory Analysis The set of statistical methods available to developmentalists is continually being expanded, allowing for questions about change over time to be addressed in new, informative ways. Indeed, new developments in methods to model change over time create the possibility for new research questions to be posed. Latent transition analysis, a longitudinal extension of latent class analysis, is a method that can be used to model development in discrete latent variables, for example, stage processes, over two or more times. The current article illustrates this approach using a new SAS procedure, PROC LTA, to model change over time in adolescent and young adult dating and sexual risk behavior. Gender differences are examined, and substance use behaviors are included as predictors of initial status in dating and sexual risk behavior and transitions over time.
	Bibliography Citation Lanza, Stephanie T. and Linda M. Collins. "A New SAS Procedure for Latent Transition Analysis: Transitions in Dating and Sexual Risk Behavior ." Developmental Psychology 44,2 (March 2008): 446-456.

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