Extending covariance structure analysis for multivariate and functional data

Autor: Sheppard, Therese

For multivariate data, when testing homogeneity of covariance matrices arising from two or more groups, Bartlett's (1937) modified likelihood ratio test statistic is appropriate to use under the null hypothesis of equal covariance matrices where the

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SMM902179 Supplemental Material - Supplemental material for Modeling of cumulative effects of time-varying drug exposures on within-subject changes in a continuous outcome

Autor: Danieli, Coraline, Sheppard, Therese, Costello, Ruth, Dixon, William G, Abrahamowicz, Michal

Supplemental material, SMM902179 Supplemental Material for Modeling of cumulative effects of time-varying drug exposures on within-subject changes in a continuous outcome by Coraline Danieli, Therese Sheppard, Ruth Costello, William G Dixon and Micha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::000d4ad1471e0c1ac2a38e25bc03c78b

Assumptions made when preparing drug exposure data for analysis have an impact on results: An unreported step in pharmacoepidemiology studies

Autor: Pye, Stephen, Sheppard, Therese, Joseph, Rebecca, Lunt, Mark, Girard, Nadyne, Haas, Jennifer S., Bates, David W, Buckeridge, David L, Van Staa, Tjeerd, Tamblyn, Robyn, Dixon, William

Publikováno v: Pye, S, Sheppard, T, Joseph, R, Lunt, M, Girard, N, Haas, J S, Bates, D W, Buckeridge, D L, Van Staa, T, Tamblyn, R & Dixon, W 2018, ' Assumptions made when preparing drug exposure data for analysis have an impact on results: an unreported step in pharmacoepidemiology studies ', Pharmacoepidemiology and Drug Safety . https://doi.org/10.1002/pds.4440

Purpose: Real-world data for observational research commonly requires formatting and cleaning prior to analysis. Data preparation steps are rarely reported adequately and are likely to vary between research groups. Variation in methodology could pote

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https://dspace.library.uu.nl/handle/1874/377497