Yujiao Mai


Yujiao Mai received her Bachelor degree in computer science and technology in 2005, Master degree in developmental psychology in 2008, and PhD in quantitative psychology in 2014 at South China Normal University. She then finished postdoc trainings in quantitative psychology at the University of Notre Dame, and biostatistics at the University of Central Florida and St. Jude Children's Research Hospital. Yujiao’s recent research interests include Applied statistical techniques for cancer survivorship research, structural equation modeling (SEM), psychological measurement, machine learning, and software development. She is currently seeking for a new position in the field of cancer research.

Yujiao is speaking at

March 15, 2021
1:00 pm - 2:00 pm



Authors: Yujiao Mai, To be determined; Deo Kumar Srivastava, St. Jude Children's Research Hospital; Kevin R. Krull, St. Jude Children's Research Hospital

The sum score of multiple items is commonly used in clinical practice to measure an intended variable/construct but, often, is not very reliable and could lead to incorrect diagnosis or statistical inference. It is important to assess the composite reliability (CR) of the sum score before using it instead of its alternatives, factor-score and latent-variable methods. Cronbach alpha has been popular in estimating CR regardless of its often under- or over-estimation of the CR. MacDonald omega is more accurate but less easy-to-use. However, both methods are not appropriate for multidimensional scales with overlapping items that are related to more than one construct. This study proposes a new CR coefficient, Omega-ESEM, based on exploratory structural equation modeling (ESEM) to overcome this limitation. Extensive Monte Carlo simulations show that Omega-ESEM generally outperforms MacDonald Omega and Cronbach alpha in terms of accuracy, precision, and coverage rates of confidence interval. We implement Omega-ESEM in an R package and apply it to evaluate the CR of PedsQL Multidimensional Fatigue Scale among young adult cancer survivors and provide a guideline for scoring the scale.

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