Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Sarah M, Kreidler"'
Publikováno v:
PLoS ONE, Vol 16, Iss 7, p e0254811 (2021)
We derive a noncentral [Formula: see text] power approximation for the Kenward and Roger test. We use a method of moments approach to form an approximate distribution for the Kenward and Roger scaled Wald statistic, under the alternative. The result
Externí odkaz:
https://doaj.org/article/b1e26b13d0d641eb804b9a3ac3bc691c
Autor:
Sarah M. Kreidler, Keith E. Muller, Gary Grunwald, Brandy M. Ringham, Zacchary T. Coker-Dukowitz, Uttara R. Sakhadeo, Anna E. Barón, Deborah H. Glueck
Publikováno v:
Journal of Statistical Software, Vol 54, Iss 1, Pp 1-26 (2013)
GLIMMPSE is a free, web-based software tool that calculates power and sample size for the general linear multivariate model with Gaussian errors (http://glimmpse.SampleSizeShop.org/). GLIMMPSE provides a user-friendly interface for the computation of
Externí odkaz:
https://doaj.org/article/59ba8b3dd5744cdb80ddfa9ac7f4226d
Publikováno v:
PLoS ONE, Vol 9, Iss 12, p e102082 (2014)
Researchers seeking to develop complex statistical applications for mobile devices face a common set of difficult implementation issues. In this work, we discuss general solutions to the design challenges. We demonstrate the utility of the solutions
Externí odkaz:
https://doaj.org/article/bdb5c61cd2ef46d0ac9860ae03f4d3f8
Publikováno v:
Bayesian Anal. 15, no. 4 (2020), 1139-1167
Longitudinal cohorts are a valuable resource for studying HIV disease progression; however, dropout is common in these studies. Subjects often fail to return for visits due to disease progression, loss to follow-up, or death. When dropout depends on
Publikováno v:
BMC Medical Research Methodology
BMC Medical Research Methodology, Vol 20, Iss 1, Pp 1-14 (2020)
BMC Medical Research Methodology, Vol 20, Iss 1, Pp 1-14 (2020)
Background Dropout is a common problem in longitudinal clinical trials and cohort studies, and is of particular concern when dropout occurs for reasons that may be related to the outcome of interest. This paper reviews common parametric models to acc
Publikováno v:
Communications in Statistics - Theory and Methods. 48:1149-1165
Under an assumption that missing values occur randomly in a matrix, formulae are developed for the expected value and variance of six statistics that summarize the number and location of the missing values. For a seventh statistic, a regression model
Publikováno v:
PLoS ONE
PLoS ONE, Vol 16, Iss 7, p e0254811 (2021)
PLoS ONE, Vol 16, Iss 7, p e0254811 (2021)
We derive a noncentral F power approximation for the Kenward and Roger test. We use a method of moments approach to form an approximate distribution for the Kenward and Roger scaled Wald statistic, under the alternative. The result depends on the app
Publikováno v:
Communications in statistics: theory and methods. 48(6)
We describe a noncentral ℱ power approximation for hypotheses about fixed predictors in general linear multivariate models with one or more Gaussian covariates. The results apply to both single and multiple parameter hypotheses. The approach extend
Autor:
Ronald J. Schmitt, Brian M. Bagrosky, Jennifer J. Kwak, Karl D. Lewis, Sarah M. Kreidler, Rodabe N. Amaria, Rene Gonzalez, Deborah H. Glueck, Phillip J. Koo
Publikováno v:
Nuclear Medicine Communications. 37:122-128
PurposeMetabolic response to treatment measured by fluorine-18 fluorodeoxyglucose (18F-FDG) PET has prognostic implications in many cancers. This study investigated the association between survival and early changes on 18F-FDG PET/computed tomography
Autor:
Maria Albuja-Cruz, Nayana U. Patel, Sarah M. Kreidler, Kristin McKinney, Teresa M. Bieker, Joshua P. Klopper, Paul Russ, Deborah H. Glueck, Katherine M. Roberts, Bryan R. Haugen
Publikováno v:
Journal of Clinical Ultrasound. 44:143-151
Purpose To identify sonographic features of cervical lymph nodes (LNs) that are associated with papillary thyroid cancer (PTC) and to develop a prediction model for classifying nodes as metastatic or benign. Methods This retrospective study included