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    Category: Help Desk

    I have a fair amount of missing data that I don’t want to delete prior to my analysis. What are the best options available for me to retain these partially missing cases?

    Missing data are a common problem faced by nearly all data analysts, particularly with the increasing emphasis on the collection of repeated assessments over time.…

    CenterStat February 26, 2020
    0 Comments

    The Cronbach’s Alphas for all the scales in my path analysis are in the .7s, so why is a reviewer criticizing me for not paying sufficient attention to reliability?

    The issue of reliability can be a complex and often misunderstood issue. Entire text books have been written about reliability, validity, and scale construction, so…

    CenterStat December 21, 2019
    0 Comments

    How can I estimate statistical power for a structural equation model?

    This is a question that often arises when using structural equation models in practice, sometimes once a study is completed but more often in the…

    CenterStat July 6, 2019
    0 Comments

    What are modification indices and should I use them when fitting SEMs to my own data?

    This is a great question and is one that prompts much disagreement among quantitative methodologists. Nearly all confirmatory factor analysis or structural equation models impose…

    CenterStat June 10, 2019
    0 Comments

    Do you have any materials that demonstrate how to estimate structural equation models using lavaan in R?

    This is a question we often hear, particularly from students and junior researchers who don’t have access to sometimes expensive commercial software for fitting structural…

    CenterStat April 25, 2019
    0 Comments

    How do you choose the best longitudinal data analytic method for testing your research questions?

    We have worked with statistical models for longitudinal data for more than two decades and this remains a vexing question to us both. There are…

    CenterStat April 2, 2019
    0 Comments

    What is the difference between a growth model estimated as a multilevel model versus as a structural equation model?

    This very common question reflects a great deal of unnecessary confusion about how to select a specific analytic approach for modeling longitudinal data. The general…

    CenterStat February 19, 2019
    0 Comments

    How can I define nonlinear trajectories in a growth curve model?

    Growth curve models, whether estimated as a multilevel model (MLM) or a structural equation model (SEM), have become widely used in many areas of behavioral,…

    CenterStat February 6, 2019
    0 Comments

    Can I estimate an SEM if the sample data are not normally distributed?

    Continuous distributions are typically described by their mean (central tendency), variance (spread), skew (asymmetry), and kurtosis (thickness of tails). A normal distribution assumes a skew…

    CenterStat January 23, 2019
    0 Comments

    How do I know if my structural equation model fits the data well?

    This is one of the most common questions we receive and, unfortunately, there are no quick answers. However, there are some initial guidelines that can…

    CenterStat January 11, 2019
    0 Comments
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    • CBA Completes 3-Day Intro to SEM Webinar May 10, 2020

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