Results 31 to 40 of about 391,534 (273)

Predictors of transition in smoking stages in Iranian adolescents: latent transition analysis

Eastern Mediterranean Health Journal, 2014
This study determined the prevalence of smoking stages in adolescents, the probability of transition across stages and the personal and environmental predictors of transition. A school-based study was conducted in 2010-11 using a random sample of 5197 students (mean age 15.7 years) in Tabriz city. The students were evaluated twice, 12-months apart. The
A, Mohammadpoorasl, S, Nedjat, A, Fakhari, K, Yazdani, A, Fotouhi   +4 more
openaire   +2 more sources

Information matrix for hidden Markov models with covariates [PDF]

, 2014
For a general class of hidden Markov models that may include time-varying covariates, we illustrate how to compute the observed information matrix, which may be used to obtain standard errors for the parameter estimates and check model identifiability ...
F., Bartolucci, Farcomeni, Alessio
core   +1 more source

Introduction to the Best Practice Recommendations for Longitudinal Latent Transition Analysis. [PDF]

Int J Psychol
ABSTRACTThe use of finite mixture models to identify a limited number of mutually exclusive latent (i.e., unknown) subgroups (i.e., classes or profiles) based on individuals' survey responses, observational and/or physiological values. Finite mixture modelling is also an active area of quantitative methodological research and advancement, which means ...
Moore EWG, Quartiroli A, Little TD.
europepmc   +3 more sources

Patterns and transitions in substance use among young Swiss men: a latent transition analysis approach [PDF]

, 2014
This study investigates the potential stages of drug use. Data from the longitudinal Cohort Study on Substance Use Risk Factors were used (N = 5,116). Drug use (alcohol, tobacco, and 16 illicit drugs) over the previous 12 months was assessed at two time ...
Baggio, S., Daeppen, J.-B., Deline, S., Dupuis, M., Gmel, G., Henchoz, Y., Mohler-Kuo, M., N'Goran, A., Studer, J.   +8 more
core   +1 more source

An analysis of factors influencing the development of depressive symptoms among postgraduate students: The roles of adaptation challenges, employment stress, and romantic troubles

陆军军医大学学报
Objective To explore the transition patterns of latent classes of depressive symptoms among postgraduate students and their influencing factors. Methods A prospective cohort study was conducted.
LUO Gui, LUO Gui, GAO Bin
doaj   +1 more source

High School Course-Completion Trajectories and College Pathways for All: A Transcript Analysis Study on Elective Computer Science Courses

Education Sciences, 2022
Whereas researchers regard high school math and science coursework as the best indicator of college readiness for students in the United States, computer science coursework and its relationship to college attendance, particularly for minoritized students,
Hsun-Yu Chan, Ting-Lan Ma, Guan K. Saw, Yen-Ming Huang   +3 more
doaj   +1 more source

A shared-parameter continuous-time hidden Markov and survival model for longitudinal data with informative dropout [PDF]

, 2019
A shared-parameter approach for jointly modeling longitudinal and survival data is proposed. With respect to available approaches, it allows for time-varying random effects that affect both the longitudinal and the survival processes. The distribution of
Andersen, Athanasopoulos, Barbati, Bartolucci, Bartolucci, Bartolucci, Bartolucci, Bartolucci, Bartolucci, Bartolucci, Baum, Böckenholt, Coelho, Conover, Cox, Dempster, Farcomeni, Farcomeni, Farcomeni, Finos, Follmann, Gigli, Goodman, Guo, Guo, James, Lange, Lange, Liggett, Marino, Marino, Maruotti, McCullagh, McHugh, Metzner, Pirone, Rizopoulos, Rizopoulos, Rizopoulos, Roy, Schwarz, Spagnoli, Titman, Tsonaka, Unkel, Verbeke, Welch, Wu, Wulfsohn, Zhang   +49 more
core   +1 more source

Scaling laws for the 2d 8-state Potts model with Fixed Boundary Conditions

, 2002
We study the effects of frozen boundaries in a Monte Carlo simulation near a first order phase transition. Recent theoretical analysis of the dynamics of first order phase transitions has enabled to state the scaling laws governing the critical regime of
A. Hintermann, A.M. Ferrenberg, B. Gorbunov, B.A. Weinstein, B.V. Enüstün, C. Borgs, C. Borgs, C. Borgs, C. Borgs, F.Y. Wu, F.Y. Wu, G.K. Saviddy, J. Jersak, J. Lee, J. Lee, J.F. Wendelken, K. Binder, K. Binder, M. Baig, M. Baig, M. Baig, M. Baig, M.S.S. Challa, N. Madras, R. Marx, R. Villanova, R.B. Potts, R.G. Miller, R.J. Baxter, R.J. Baxter, S.C. Mraw, V. Privman, V.N. Bogometav, W. Janke   +33 more
core   +1 more source

Spectral Density Study of the SU(3) Deconfining Phase Transition

, 1992
We present spectral density reweighting techniques adapted to the analysis of a time series of data with a continuous range of allowed values. In a first application we analyze action and Polyakov line data from a Monte Carlo simulation on $L_t L^3 (L_t ...
Alves, Alves, Alves, Alves, Aoki, Bacilieri, Bacilieri, Bennett, Berg, Berg, Berg, Berg, Berg, Bernd A. Berg, Bhanot, Bitar, Brown, Celik, Christ, Falcioni, Ferrenberg, Ferrenberg, Ferrenberg, Fisher, Flyvbjerg, Fukugita, Fukugita, Itzykson, Karliner, Kennedy, Kogut, Marinari, McDonald, Nelson A. Alves, Press, Salsburg, Sergiu Sanielevici, Sokal, Ukawa, Valleau, Van der Waerden   +40 more
core   +1 more source

Adolescent substance use: Latent class and transition analysis

Addictive Behaviors, 2018
The prevention and intervention of adolescent substance use is a public health priority. Most adolescents will engage in some form of substance use, and a sizeable minority will transition to using multiple substances. An emerging body of research takes a person-centered approach to model adolescent substance use over time; however, the findings have ...
Hye Jeong Choi, Yu Lu, Marya Schulte, Jeff R. Temple   +3 more
openaire   +3 more sources