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Download full textGill, Brian P.; Goyal, Ravi; Hotchkiss, John – Mathematica, 2020
Schools across Pennsylvania and around the country are beginning the 2020-2021 school year while COVID-19 remains a threat in widely varying degrees, in different communities, and at different times. Every school that is opening its building to students--part-time or full-time, starting now or later in the school year--needs to contemplate the…
Descriptors: COVID-19, Pandemics, School Closing, Disease Control
Peer reviewed
Direct linkMoeyaert, Mariola; Ugille, Maaike; Ferron, John M.; Beretvas, S. Natasha; Van den Noortgate, Wim – Journal of Experimental Education, 2016
The impact of misspecifying covariance matrices at the second and third levels of the three-level model is evaluated. Results indicate that ignoring existing covariance has no effect on the treatment effect estimate. In addition, the between-case variance estimates are unbiased when covariance is either modeled or ignored. If the research interest…
Descriptors: Hierarchical Linear Modeling, Monte Carlo Methods, Computation, Statistical Bias
