Tenko Raykov

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All published works
Action Title Year Authors
+ Can One Pool Over Site in a Multi-Site Study With Categorical Item Measuring Instruments?: A Multiple Testing Procedure 2024 Tenko Raykov
Khaled Alkherainej
+ A Note on Evaluation of Polytomous Item Locations With the Rating Scale Model and Testing Its Fit 2024 Tenko Raykov
Martin Pusic
+ Bayesian Maximal Reliability Evaluation Using Latent Variable Modeling 2024 Tenko Raykov
George A. Marcoulides
Natalja Menold
+ Overall Model Fit Does Not Imply Linearity in Longitudinal Structural Equation Models: Examining Linear Change Over Time Using Latent Variable Modeling 2024 Tenko Raykov
Christine DiStefano
Natalja Menold
+ Examining the Dynamic of Clustering Effects in Multilevel Designs: A Latent Variable Method Application 2024 Tenko Raykov
Ahmed Haddadi
Christine DiStefano
Mohammed Alqabbaa
+ Measurement Invariance is Not Sufficient for Meaningful and Valid Group Comparisons: A Note on Robitzsch and Lüdtke 2024 Tenko Raykov
+ Scale Reliability Evaluation Using Bayesian Analysis: A Latent Variable Modeling Procedure 2024 Tenko Raykov
George A. Marcoulides
Randall E. Schumacker
+ Estimating the Irreducible Uncertainty in Visual Diagnosis: Statistical Modeling of Skill Using Response Models 2023 Martin Pusic
Amy Rapkiewicz
Tenko Raykov
Jonathan Melamed
+ A Note on Comparing the Bifactor and Second-Order Factor Models: Is the Bayesian Information Criterion a Routinely Dependable Index for Model Selection? 2023 Tenko Raykov
Christine DiStefano
Lisa Calvocoressi
+ Item Response Theory and Modeling with Stata 2023 Tenko Raykov
+ Applications of Bayesian Confirmatory Factor Analysis in Behavioral Measurement: Strong Convergence of a Bayesian Parameter Estimator 2022 Tenko Raykov
Philipp Doebler
George A. Marcoulides
+ On the Importance of Coefficient Alpha for Measurement Research: Loading Equality Is Not Necessary for Alpha’s Utility as a Scale Reliability Index 2022 Tenko Raykov
James C. Anthony
Natalja Menold
+ On Effect Size Measures for Nested Measurement Models 2022 Tenko Raykov
Christine DiStefano
Lisa Calvocoressi
Martin A. Volker
+ Evaluation of Response Probabilities along Studied Latent Dimensions: A Polytomous Item Extension 2021 Tenko Raykov
Chuck Huber
George A. Marcoulides
Martin Pusic
Natalja Menold
+ Design Effect in Multilevel Settings: A Commentary on a Latent Variable Modeling Procedure for Its Evaluation 2021 Tenko Raykov
Christine DiStefano
+ Interval Estimation of Item Response Probabilities Along Studied Latent Dimensions 2021 Tenko Raykov
George A. Marcoulides
Martin Pusic
+ On the Pitfalls of Estimating and Using Standardized Reliability Coefficients 2020 Tenko Raykov
George A. Marcoulides
+ Can the One-Parameter Logistic Model Be a Spurious Finding for a Heterogeneous Population? 2019 Tenko Raykov
George A. Marcoulides
Michael Harrison
+ Examining Class Separation Contribution by Observed Indicators in Latent Class Models: A Multiple Testing Procedure 2019 Tenko Raykov
Michael Harrison
George A. Marcoulides
+ Examining Validity-Related Correlations and Their Differences Under Assumption Violations 2019 Tenko Raykov
Abdullah Ali AL-Qataee
Dimiter M. Dimitrov
+ Evaluation of Variance Inflation Factors in Regression Models Using Latent Variable Modeling Methods 2018 Katerina M. Marcoulides
Tenko Raykov
+ Revisiting the Bi-Factor Model: Can Mixture Modeling Help Assess Its Applicability? 2018 Tenko Raykov
George A. Marcoulides
Natalja Menold
Michael Harrison
+ Using Latent Variable Modeling for Discrete Time Survival Analysis: Examining the Links of Depression to Mortality 2017 Tenko Raykov
Anna Zajacova
Philip B. Gorelick
George A. Marcoulides
+ PDF Chat Thanks Coefficient Alpha, We Still Need You! 2017 Tenko Raykov
George A. Marcoulides
+ On the Potential of Discrete Time Survival Analysis Using Latent Variable Modeling: An Application to the Study of the Vascular Depression Hypothesis 2017 Tenko Raykov
Philip B. Gorelick
Anna Zajacova
George A. Marcoulides
+ PDF Chat On the Unlikely Case of an Error-Free Principal Component From a Set of Fallible Measures 2017 Tenko Raykov
George A. Marcoulides
Tenglong Li
+ PDF Chat On Studying Common Factor Dominance and Approximate Unidimensionality in Multicomponent Measuring Instruments With Discrete Items 2016 Tenko Raykov
George A. Marcoulides
+ Improved Estimation of Maximal Reliability for Unidimensional Multicomponent Measuring Instruments in Repeated Measure Studies 2016 Tenko Raykov
George A. Marcoulides
Siegfried Gabler
+ On Examining Specificity in Latent Construct Indicators 2016 Tenko Raykov
George A. Marcoulides
+ Evaluation of Maximal Reliability for Unidimensional Measuring Instruments With Correlated Errors 2016 Siegfried Gabler
Tenko Raykov
+ Maximal Criterion Validity and Scale Criterion Validity: A Latent Variable Modeling Approach for Examining Their Difference 2016 Tenko Raykov
Siegfried Gabler
Dimiter M. Dimitrov
+ PDF Chat On the Fallibility of Principal Components in Research 2016 Tenko Raykov
George A. Marcoulides
Tenglong Li
+ Examining Population Heterogeneity in Finite Mixture Settings Using Latent Variable Modeling 2016 Tenko Raykov
George A. Marcoulides
Chi Chang
+ PDF Chat Evaluation of Measurement Instrument Criterion Validity in Finite Mixture Settings 2015 Tenko Raykov
George A. Marcoulides
Tenglong Li
+ PDF Chat Do Two or More Multicomponent Instruments Measure the Same Construct? Testing Construct Congruence Using Latent Variable Modeling 2015 Tenko Raykov
George A. Marcoulides
Bing Tong
+ Maximal Reliability and Composite Reliability: Examining Their Difference for Multicomponent Measuring Instruments Using Latent Variable Modeling 2015 Tenko Raykov
Siegfried Gabler
Dimiter M. Dimitrov
+ Scale Reliability Evaluation Under Multiple Assumption Violations 2015 Tenko Raykov
George A. Marcoulides
+ Evaluation of Multicomponent Measuring Instrument Reliability in Complex Design Studies 2015 Tenko Raykov
Anne Traynor
+ Examining Normality in Incomplete Data Sets: A Note on a Multiple Testing Approach 2015 Tenko Raykov
Chun-Lung Lee
George A. Marcoulides
+ On Enhancing Plausibility of the Missing at Random Assumption in Incomplete Data Analyses via Evaluation of Response-Auxiliary Variable Correlations 2015 Tenko Raykov
Brady T. West
+ Examining Intermediate Omitted Levels in Hierarchical Designs via Latent Variable Modeling 2015 Tenko Raykov
Thanos Patelis
George A. Marcoulides
Chun-Lung Lee
+ On Examining the Underlying Normal Variable Assumption in Latent Variable Models With Categorical Indicators 2015 Tenko Raykov
George A. Marcoulides
+ PDF Chat Intraclass Correlation Coefficients in Hierarchical Design Studies With Discrete Response Variables 2015 Tenko Raykov
George A. Marcoulides
+ PDF Chat Scale Reliability Evaluation With Heterogeneous Populations 2014 Tenko Raykov
George A. Marcoulides
+ Evaluation of Coefficient Alpha for Multiple-Component Measuring Instruments in Complex Sample Designs 2014 Tenko Raykov
Brady T. West
Anne Traynor
+ Optimal Shortening of Multiple-Component Measuring Instruments: A Latent Variable Modeling Procedure 2014 Tenko Raykov
Cindy Rodenberg
Arunachalam Narayanan
+ PDF Chat The Importance of the Assumption of Uncorrelated Errors in Psychometric Theory 2014 Tenko Raykov
George A. Marcoulides
Thanos Patelis
+ Population Proportion of Explained Variance in Principal Component Analysis: A Note on Its Evaluation Via a Large-Sample Approach 2014 Tenko Raykov
George A. Marcoulides
+ PDF Chat Examining Measure Correlations With Incomplete Data Sets 2014 Tenko Raykov
Brooke C. Schneider
George A. Marcoulides
Peter A. Lichtenberg
+ PDF Chat A Direct Latent Variable Modeling Based Method for Point and Interval Estimation of Coefficient Alpha 2014 Tenko Raykov
George A. Marcoulides
+ Identifying Useful Auxiliary Variables for Incomplete Data Analyses 2013 Tenko Raykov
George A. Marcoulides
+ Basic statistics: an introduction with R 2013 Tenko Raykov
George A. Marcoulides
+ Meta-Analysis of Scale Reliability Using Latent Variable Modeling 2013 Tenko Raykov
George A. Marcoulides
+ Studying Differential Item Functioning via Latent Variable Modeling 2013 Tenko Raykov
George A. Marcoulides
Chun-Lung Lee
Chi Chang
+ Essential Unidimensionality Examination for Multicomponent Scales 2013 Tenko Raykov
Steffi Pohl
+ On Latent Change Model Choice in Longitudinal Studies 2012 Tenko Raykov
Anna Zajacova
+ Examining the Missing Completely at Random Mechanism in Incomplete Data Sets: A Multiple Testing Approach 2012 Tenko Raykov
Peter A. Lichtenberg
Daniel Paulson
+ Evaluation of Validity and Reliability for Hierarchical Scales Using Latent Variable Modeling 2012 Tenko Raykov
George A. Marcoulides
+ Factorial Invariance in Multiple Populations 2012 Tenko Raykov
George A. Marcoulides
Roger E. Millsap
+ Propensity Score Analysis With Fallible Covariates 2012 Tenko Raykov
+ On Testability of Missing Data Mechanisms in Incomplete Data Sets 2011 Tenko Raykov
+ Examining Parallelism of Sets of Psychometric Measures Using Latent Variable Modeling 2011 Tenko Raykov
Thanos Patelis
George A. Marcoulides
+ Intraclass Correlation Coefficients in Hierarchical Designs: Evaluation Using Latent Variable Modeling 2011 Tenko Raykov
+ Evaluation of Reliability Coefficients for Two-Level Models via Latent Variable Analysis 2010 Tenko Raykov
Spiridon Penev
+ Multivariate Effect Size Estimation: Confidence Interval Construction via Latent Variable Modeling 2010 Tenko Raykov
George A. Marcoulides
+ Evaluation of latent construct correlations in the presence of missing data: A note on a latent variable modelling approach 2010 Tenko Raykov
+ Scale validity evaluation with congeneric measures in hierarchical designs 2010 Tenko Raykov
+ Proportion of general factor variance in a hierarchical multiple-component measuring instrument: A note on a confidence interval estimation procedure 2010 Tenko Raykov
Richard E. Zinbarg
+ Group Comparisons in the Presence of Missing Data Using Latent Variable Modeling Techniques 2010 Tenko Raykov
George A. Marcoulides
+ Testing multivariate mean collinearity via latent variable modelling 2009 Tenko Raykov
Spiridon Penev
+ Proportion of third‐level variation in multi‐level studies: A note on an interval estimation procedure 2009 Tenko Raykov
+ Evaluation of Scale Reliability for Unidimensional Measures Using Latent Variable Modeling 2009 Tenko Raykov
+ Interval Estimation of Revision Effect on Scale Reliability via Covariance Structure Modeling 2009 Tenko Raykov
+ PDF Chat A method of bias correction for maximal reliability with dichotomous measures 2009 Spiridon Penev
Tenko Raykov
+ Interval Estimation of Interitem and Item-Total Correlations for Multiple Component Measuring Instruments With Ordinal Items 2009 Tenko Raykov
Gerhard Mels
+ Comparison of Mediated Effects: A Correlation Structure Modeling Approach 2008 Tenko Raykov
Mark Brennan‐Ing
Joann P. Reinhardt
Amy Horowitz
+ Testing Time-Invariance of Variable Specificity in Repeated Measure Designs Using Structural Equation Modeling 2008 Tenko Raykov
Yasuo Amemiya
+ An Introduction to Applied Multivariate Analysis 2008 Tenko Raykov
George A. Marcoulides
+ Estimation of maximal reliability for multiple‐component instruments in multilevel designs 2008 Tenko Raykov
Spiridon Penev
+ Introduction to applied multivariate analysis 2008 Tenko Raykov
George A. Marcoulides
+ Lower Level Mediation Effect Analysis in Two-Level Studies: A Note on a Multilevel Structural Equation Modeling Approach 2007 Tenko Raykov
Gerhard Mels
+ Evaluation of Revision Effect on Criterion Validity of Multiple-Component Measuring Instruments 2007 Tenko Raykov
+ Alpha if item deleted: A note on loss of criterion validity in scale development if maximizing coefficient alpha 2007 Tenko Raykov
+ Longitudinal Analysis With Regressions Among Random Effects: A Latent Variable Modeling Approach 2007 Tenko Raykov
+ Longitudinal Analysis With Regressions Among Random Effects: A Latent Variable Modeling Approach 2007 Tenko Raykov
+ Reliability of multiple‐component measuring instruments: Improved evaluation in repeated measure designs 2006 Tenko Raykov
+ Reliability if deleted, not ‘alpha if deleted’: Evaluation of scale reliability following component deletion 2006 Tenko Raykov
+ Examining Temporal Stability of Scale Validity in Longitudinal Studies 2006 Tenko Raykov
+ On the Relationship Between Maximal Reliability and Maximal Validity of Linear Composites 2006 Spiridon Penev
Tenko Raykov
+ Maximal reliability and power in covariance structure models 2006 Spiridon Penev
Tenko Raykov
+ A Direct Method for Obtaining Approximate Standard Error and Confidence Interval of Maximal Reliability for Composites With Congeneric Measures 2006 Tenko Raykov
Spiridon Penev
+ On Multilevel Model Reliability Estimation From the Perspective of Structural Equation Modeling 2006 Tenko Raykov
George A. Marcoulides
+ Studying group and time invariance in maximal reliability for multiple‐component measuring instruments via covariance structure modelling 2005 Tenko Raykov
+ Estimation of reliability for multiple‐component measuring instruments in test–retest designs 2005 Tenko Raykov
Spiridon Penev
+ Estimation of Reliability for Multiple-Component Measuring Instruments in Hierarchical Designs 2005 Tenko Raykov
S. H. C. du Toit
+ Analysis of Longitudinal Studies With Missing Data Using Covariance Structure Modeling With Full-Information Maximum Likelihood 2005 Tenko Raykov
+ Examining change in maximal reliability for multiple‐component measuring instruments 2005 Tenko Raykov
Gregory R. Hancock
+ A method for testing group differences of scale validity in multiple population studies 2005 Tenko Raykov
+ Bias-Corrected Estimation of Noncentrality Parameters of Covariance Structure Models 2005 Tenko Raykov
+ Examining time‐invariance in reliability in multi‐wave, multi‐indicator models: A covariance structure analysis approach accounting for indicator specificity 2004 Tenko Raykov
John Tisak
+ Using the Delta Method for Approximate Interval Estimation of Parameter Functions in SEM 2004 Tenko Raykov
George A. Marcoulides
+ Point and Interval Estimation of Reliability for Multiple-Component Measuring Instruments via Linear Constraint Covariance Structure Modeling 2004 Tenko Raykov
+ Validation of Cognitive Structures: A Structural Equation Modeling Approach 2003 Dimiter M. Dimitrov
Tenko Raykov
+ Reliability of Scales With General Structure: Point and Interval Estimation Using a Structural Equation Modeling Approach 2002 Tenko Raykov
Patrick E. Shrout
+ Analytic Estimation of Standard Error and Confidence Interval for Scale Reliability 2002 Tenko Raykov
+ Estimation of congeneric scale reliability using covariance structure analysis with nonlinear constraints 2001 Tenko Raykov
+ Examination of Trends in Covariance Structure Model Parameters: An Application to the Study of Increasing Complexity of Ability Measures 2001 Tenko Raykov
George A. Marcoulides
+ Testing Multivariable Covariance Structure and Means Hypotheses via Structural Equation Modeling 2001 Tenko Raykov
+ Bias of Coefficient afor Fixed Congeneric Measures with Correlated Errors 2001 Tenko Raykov
+ The Problem of Equivalent Structural Equation Models: An Individual Residual Perspective 2001 Tenko Raykov
Spiridon Penev
+ On Sensitivity of Structural Equation Modeling to Latent Relation Misspecifications 2000 Tenko Raykov
+ A Method for Examining Stability in Reliability 2000 Tenko Raykov
+ On the Large-Sample Bias, Variance, and Mean Squared Error of the Conventional Noncentrality Parameter Estimator of Covariance Structure Models 2000 Tenko Raykov
+ A Wiener Germ approximation of the noncentral chi square distribution and of its quantiles 2000 Spiridon Penev
Tenko Raykov
+ A Method for Comparing Completely Standardized Solutions in Multiple Groups 2000 Tenko Raykov
George A. Marcoulides
+ On desirability of parsimony in structural equation model selection 1999 Tenko Raykov
George A. Marcoulides
+ A Method for Obtaining Standard Errors and Confidence Intervals of Composite Reliability for Congeneric Items 1998 Tenko Raykov
+ On Measures of Explained Variance in Nonlinear Strctural Equations Models 1998 Peter M. Bentler
Tenko Raykov
+ On the use of confirmatory factor analysis in personality research 1998 Tenko Raykov
+ Scale Reliability, Cronbach's Coefficient Alpha, and Violations of Essential Tau-Equivalence with Fixed Congeneric Components 1997 Tenko Raykov
+ Estimation of Composite Reliability for Congeneric Measures 1997 Tenko Raykov
+ Equivalent Structural Equation Models and Group Equality Constraints 1997 Tenko Raykov
+ Initial Value Dependence: A Comparison of Two Methods For Its Study 1996 Tenko Raykov
Spiridon Penev
+ On statistical approaches to the study of the ?Law of Initial Values? 1995 Tenko Raykov
+ Multivariate Structural Modeling of Plasticity in Fluid Intelligence of Aged Adults 1995 Tenko Raykov
+ On task complexity and “simplex” correlation matrices 1993 Tenko Raykov
Lazar Stankov
+ Classical test theory based and factor analytic structural models for analyzing change: A note on differences and similarities 1993 Tenko Raykov
+ On choosing estimators'in a simple linear errors-in-variables model 1993 Spiridon Penev
Tenko Raykov
+ On Some Problems in Measuring Change on Ordinal Data 1987 B. Krause
Tenko Raykov
Common Coauthors
Commonly Cited References
Action Title Year Authors # of times referenced
+ PDF Chat Beyond SEM: General Latent Variable Modeling 2002 Bengt Muthén
43
+ Statistical analysis of sets of congeneric tests 1971 Karl G. Jöreskog
42
+ STATISTICAL ANALYSIS OF SETS OF CONGENERIC TESTS* 1969 Karl G. Jöreskog
37
+ Using the Delta Method for Approximate Interval Estimation of Parameter Functions in SEM 2004 Tenko Raykov
George A. Marcoulides
22
+ An Introduction to Applied Multivariate Analysis 2008 Tenko Raykov
George A. Marcoulides
19
+ PDF Chat Coefficient alpha and the internal structure of tests 1951 Lee J. Cronbach
18
+ Statistical Analysis With Missing Data 1989 Maureen Lahiff
Roderick J. A. Little
Donald B. Rubin
16
+ Applied Missing Data Analysis 2010 Craig K. Enders
14
+ An Introduction to the Bootstrap 1994 Bradley Efron
Robert Tibshirani
14
+ Applied Multivariate Statistical Analysis 2003 Wolfgang Karl Härdle
Léopold Simar
14
+ Coefficient alpha and the reliability of composite measurements 1967 Melvin R. Novick
Charles Lewis
14
+ COEFFICIENT ALPHA AND THE RELIABILITY OF COMPOSITE MEASUREMENTS 1966 Melvin R. Novick
Charles Lewis
13
+ Estimation of congeneric scale reliability using covariance structure analysis with nonlinear constraints 2001 Tenko Raykov
12
+ Scale Reliability, Cronbach's Coefficient Alpha, and Violations of Essential Tau-Equivalence with Fixed Congeneric Components 1997 Tenko Raykov
12
+ A Course in Mathematical Statistics 1999 David W. Macky
George Roussas
12
+ Alternative Ways of Assessing Model Fit 1992 Michael W. Browne
Robert Cudeck
12
+ Controlling the False Discovery Rate: A Practical and Powerful Approach to Multiple Testing 1995 Yoav Benjamini
Yosef Hochberg
12
+ Applied Multivariate Statistical Analysis. 1988 Andrea Johnson
Dean W. Wichern
12
+ Basic statistics: an introduction with R 2013 Tenko Raykov
George A. Marcoulides
11
+ Examining Population Heterogeneity in Finite Mixture Settings Using Latent Variable Modeling 2016 Tenko Raykov
George A. Marcoulides
Chi Chang
11
+ PDF Chat Missing data: Our view of the state of the art. 2002 Joseph L. Schafer
John W. Graham
10
+ Reliability of Scales With General Structure: Point and Interval Estimation Using a Structural Equation Modeling Approach 2002 Tenko Raykov
Patrick E. Shrout
10
+ PDF Chat The control of the false discovery rate in multiple testing under dependency 2001 Yoav Benjamini
Daniel Yekutieli
9
+ On the Relationship Between Maximal Reliability and Maximal Validity of Linear Composites 2006 Spiridon Penev
Tenko Raykov
9
+ Measurement invariance, factor analysis and factorial invariance 1993 William Meredith
9
+ A comparison of inclusive and restrictive strategies in modern missing data procedures. 2001 Linda M. Collins
Joseph L. Schafer
Chi-Ming Kam
9
+ Group Comparisons in the Presence of Missing Data Using Latent Variable Modeling Techniques 2010 Tenko Raykov
George A. Marcoulides
8
+ Adding Missing-Data-Relevant Variables to FIML-Based Structural Equation Models 2003 John W. Graham
8
+ Testing Multivariable Covariance Structure and Means Hypotheses via Structural Equation Modeling 2001 Tenko Raykov
8
+ Structural Model Evaluation and Modification: An Interval Estimation Approach 1990 James H. Steiger
8
+ Bayesian Model Selection in Social Research 1995 Adrian E. Raftery
7
+ Examining time‐invariance in reliability in multi‐wave, multi‐indicator models: A covariance structure analysis approach accounting for indicator specificity 2004 Tenko Raykov
John Tisak
7
+ Estimation of Composite Reliability for Congeneric Measures 1997 Tenko Raykov
7
+ Statistical inference 2001 Tim Bedford
Roger Cooke
6
+ A Method for Obtaining Standard Errors and Confidence Intervals of Composite Reliability for Congeneric Items 1998 Tenko Raykov
6
+ Testing MANOVA Designs with LISREL 1988 Steffen Kühnel
6
+ A Direct Method for Obtaining Approximate Standard Error and Confidence Interval of Maximal Reliability for Composites With Congeneric Measures 2006 Tenko Raykov
Spiridon Penev
6
+ Coefficient alpha: A basic introduction from the perspectives of classical test theory and structural equation modeling 1995 Michael B. Miller
5
+ Analytic Estimation of Standard Error and Confidence Interval for Scale Reliability 2002 Tenko Raykov
5
+ Using multivariate statistics 1983 Barbara G. Tabachnick
Linda S. Fidell
5
+ Statistical Methods for the Social Sciences 1998 EJD
Alan Agresti
Barbara Finlay
5
+ A Method for Examining Stability in Reliability 2000 Tenko Raykov
5
+ Test Reliability and the Kuder-Richardson Formulas: Derivation From Probability Theory 1972 Donald W. Zimmerman
5
+ Specification and Estimation of Mean- and Covariance-Structure Models 1995 Michael W. Browne
Gerhard Arminger
5
+ PDF Chat Investigating population heterogeneity with factor mixture models. 2005 Gitta H. Lubke
Bengt Muthén
5
+ Bias of Coefficient afor Fixed Congeneric Measures with Correlated Errors 2001 Tenko Raykov
5
+ PDF Chat Multilevel Statistical Models 2006 Harvey Goldstein
5
+ Missing Data Analysis: Making It Work in the Real World 2008 John W. Graham
5
+ PDF Chat A general structural equation model with dichotomous, ordered categorical, and continuous latent variable indicators 1984 Bengt Muthén
5
+ Factorial Invariance in Multiple Populations 2012 Tenko Raykov
George A. Marcoulides
Roger E. Millsap
5