Kenneth C. Land
  • Kenneth C. Land

  • John Franklin Crowell Professor Emeritus of Sociology
  • Sociology
  • 347 Soc-psych, Durham, NC 27708
  • Campus Box 90088
  • Phone: (919) 660-5615
  • Fax: (919) 660-5623
  • Homepage
  • Curriculum Vitae
  • Overview

    I received my Ph.D. in sociology and mathematics from the University of Texas at Austin in 1969. After a year of postdoctoral study in mathematical statistics at Columbia University in New York City, I taught there and was a member of the staff of the Russell Sage Foundation for three years. I then was successively a member of the faculties of the University of Illinois at Urbana Champaign and the University of Texas at Austin before joining the Duke Sociology Department as Chairman in 1986. I served as Chair of Sociology from January 1986 to August 1997. My main research interests are contemporary social trends and quality-of-life measurement, social problems, demography, criminology, organizations, and mathematical and statistical models and methods for the study of social and demographic processes. I have done extensive research in each of these areas and have been elected a Fellow of the American Statistical Association (1978), the Sociological Research Association (1981), the American Association for the Advancement of Science (1992), the International Society for Quality-of-Life Studies (1997), and the American Society of Criminology (2004). I teach Contemporary Social Problems (SOCIOL 111), Advanced Methods of Demographic Analysis, and the Demography of Aging Proseminar (SOCIOL 750S). My other interests include tennis, jogging (10 kilometers), and music.
  • Specialties

    • Demographics
    • Crime and Juvenile Justice
  • Areas of Interest

    Mathematical Sociology,
    Statistical Methods,
    Demography,
    Crime, Law and Deviance,
    Social Indicators and Quality-of-Life Measurement
  • Education

      • Postdoctoral Study, Mathematical Statistics,,
      • Columbia University, New York, New York,,
      • 1970
      • Ph.D. Sociology (major) and Mathematics (minor),
      • The University of Texas at Austin,
      • 1969
      • Ph.D.,
      • University of Texas at Austin,
      • 1969
      • MA Sociology (major) and Mathematics (minor),
      • The University of Texas at Austin,
      • 1966
      • BA Sociology (major) and History (major),
      • Texas Lutheran College, Seguin, Texas,
      • 1964
  • Recent Publications

      • Q Fu and KC Land.
      • (2015).
      • The Increasing Prevalence of Overweight and Obesity of Children and Youth in China, 1989–2009: An Age–Period–Cohort Analysis.
      • Population Research and Policy Review
      • ,
      • 34
      • (6)
      • ,
      • 901-921.
      • [web]
      • H Yu, S Jiang and KC Land.
      • (2015).
      • Multicollinearity in hierarchical linear models..
      • Social science research
      • ,
      • 53
      • ,
      • 118-136.
      • [web]
      Publication Description

      This study investigates an ill-posed problem (multicollinearity) in Hierarchical Linear Models from both the data and the model perspectives. We propose an intuitive, effective approach to diagnosing the presence of multicollinearity and its remedies in this class of models. A simulation study demonstrates the impacts of multicollinearity on coefficient estimates, associated standard errors, and variance components at various levels of multicollinearity for finite sample sizes typical in social science studies. We further investigate the role multicollinearity plays at each level for estimation of coefficient parameters in terms of shrinkage. Based on these analyses, we recommend a top-down method for assessing multicollinearity in HLMs that first examines the contextual predictors (Level-2 in a two-level model) and then the individual predictors (Level-1) and uses the results for data collection, research problem redefinition, model re-specification, variable selection and estimation of a final model.

      • Y Zeng, H Chen, Z Wang and KC Land.
      • (2015).
      • Implications of changes in households and living arrangements for future home-based care needs and costs for disabled elders in China..
      • Journal of aging and health
      • ,
      • 27
      • (3)
      • ,
      • 519-550.
      • [web]
      Publication Description

      OBJECTIVES: To better understand future home-based care needs and costs for disabled elders in China. METHOD: To further develop and apply the ProFamy extended cohort-component method and the most recent census and survey data. RESULTS: (a) Chinese disabled elders and the annual growth rate of the percentage of national gross domestic product (GDP) devoted to home-based care costs for disabled elders will increase much more rapidly than the growth of total elderly population; (b) home-based care needs and costs for disabled oldest-old aged 80+ will increase much faster than that for disabled young-old aged 65-79 after 2030; (c) disabled unmarried elders living alone and their home-based care costs increase substantially faster than those disabled unmarried elders living with children; (d) percent of rural disabled oldest-old will be substantially higher than that of rural population after 2030; (e) sensitivity analyses show that possible changes in mortality and elderly disability status are the major direct factors affecting home-based care needs and costs; (f) caregivers resources under the universal two-child policy will be substantially better than that under the rigorous fertility policy unchanged. DISCUSSION: We discuss policy recommendations concerning pathways to healthy aging with relatively reduced care costs, including reductions of the prevalence of disability, gender equality, the universal two-child policy and resources of caregivers, encouragements of rural-to-urban family migration and elder's residential proximity to their adult children, and remarriages of not-married elders.

      • Y Zeng, H Chen, T Ni, R Ruan, L Feng, C Nie, L Cheng, Y Li, W Tao, J Gu, KC Land, A Yashin, Q Tan, Z Yang, L Bolund, H Yang, E Hauser, DC Willcox, BJ Willcox, XL Tian and JW Vaupel.
      • (2015).
      • GxE interactions between FOXO genotypes and drinking tea are significantly associated with prevention of cognitive decline in advanced age in China..
      • The journals of gerontology. Series A, Biological sciences and medical sciences
      • ,
      • 70
      • (4)
      • ,
      • 426-433.
      • [web]
      Publication Description

      Logistic regression analysis based on data from 822 Han Chinese oldest old aged 92+ demonstrated that interactions between carrying FOXO1A-266 or FOXO3-310 or FOXO3-292 and tea drinking at around age 60 or at present time were significantly associated with lower risk of cognitive disability at advanced ages. Associations between tea drinking and reduced cognitive disability were much stronger among carriers of the genotypes of FOXO1A-266 or FOXO3-310 or FOXO3-292 compared with noncarriers, and it was reconfirmed by analysis of three-way interactions across FOXO genotypes, tea drinking at around age 60, and at present time. Based on prior findings from animal and human cell models, we postulate that intake of tea compounds may activate FOXO gene expression, which in turn may positively affect cognitive function in the oldest old population. Our empirical findings imply that the health benefits of particular nutritional interventions, including tea drinking, may, in part, depend upon individual genetic profiles.

      • YC Yang and KC Land.
      • (2015).
      • Review of Age-Period-Cohort Analysis: New Models, Methods, and Empirical Applications.
      • JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION
      • ,
      • 110
      • (509)
      • ,
      • 457-457.
      • [web]
  • View All Publications
  • Postdoctoral Students

    • Katherin King
      • September 2011-2012
    • Jacob Moorad
      • September 2011-present
    • Ben Kail
      • September 2010-present
    • Andy Cislo
      • October 2007 - October 2009
    • Denese Ashbaugh-Vlosky
      • 2004-2006
    • Hai Huang
      • 2005-2006
    • Alexander Kulminski
      • 2005-2006
  • ict background