Výsledky vyhľadávania - "The Stata journal"

Reconstructing time-to-event data from published Kaplan-Meier curves Autor Wei, Yinghui, Royston, Patrick

“…Hazard ratios can be approximated by data extracted from published Kaplan-Meier curves. Recently, this curve approach has been extended beyond hazard-ratio…”
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conindex: Estimation of concentration indices Autor O'Donnell, Owen, O'Neill, Stephen, Van Ourti, Tom, Walsh, Brendan

“…Concentration indices are frequently used to measure inequality in one variable over the distribution of another. Most commonly, they are applied to the…”
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Cluster randomized controlled trial analysis at the cluster level: The clan command Autor Thompson, Jennifer A, Leurent, Baptiste, Nash, Stephen, Moulton, Lawrence H, Hayes, Richard J

“…In this article, we introduce a new command, clan, that conducts a cluster-level analysis of cluster randomized trials. The command simplifies adjusting for…”
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xtgeebcv: A command for bias-corrected sandwich variance estimation for GEE analyses of cluster randomized trials Autor Gallis, John A, Li, Fan, Turner, Elizabeth L

“…Cluster randomized trials, where clusters (for example, schools or clinics) are randomized to comparison arms but measurements are taken on individuals, are…”
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artbin: Extended sample size for randomized trials with binary outcomes Autor Marley-Zagar, Ella, White, Ian R, Royston, Patrick, Barthel, Friederike M-S, Parmar, Mahesh K B, Babiker, Abdel G

“…We describe the command artbin, which offers various new facilities for the calculation of sample size for binary outcome variables that are not otherwise…”
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artcat: Sample-size calculation for an ordered categorical outcome Autor White, Ian R, Marley-Zagar, Ella, Morris, Tim P, Parmar, Mahesh K B, Royston, Patrick, Babiker, Abdel G

“…We describe a new command, artcat, that calculates sample size or power for a randomized controlled trial or similar experiment with an ordered categorical…”
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Calculating level-specific SEM fit indices for multilevel mediation analyses Autor Comulada, W Scott

“…Stata's gsem command provides the ability to fit multilevel structural equation models (sem) and related multilevel models. A motivating example is provided by…”
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power swgee: GEE-based power calculations in stepped wedge cluster randomized trials Autor Gallis, John A, Wang, Xueqi, Rathouz, Paul J, Preisser, John S, Li, Fan, Turner, Elizabeth L

“…Stepped wedge cluster randomized trials are increasingly being used to evaluate interventions in medical, public health, educational, and social science…”
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kg_nchs: A command for Korn-Graubard confidence intervals and National Center for Health Statistics' Data Presentation Standards for Proportions Autor Ward, Brian W

“…In August 2017 the National Center for Health Statistics (NCHS), part of the U.S. Federal Statistical System, published new standards for determining the…”
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Reference-based sensitivity analysis via multiple imputation for longitudinal trials with protocol deviation Autor Cro, Suzie, Morris, Tim P, Kenward, Michael G, Carpenter, James R

“…Randomized controlled trials provide essential evidence for the evaluation of new and existing medical treatments. Unfortunately, the statistical analysis is…”
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Model selection for univariable fractional polynomials Autor Royston, Patrick

“…Since Royston and Altman's 1994 publication ( 43: 429-467), fractional polynomials have steadily gained popularity as a tool for flexible parametric modeling…”
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Allowing for informative missingness in aggregate data meta-analysis with continuous or binary outcomes: Extensions to metamiss Autor Chaimani, Anna, Mavridis, Dimitris, Higgins, Julian P T, Salanti, Georgia, White, Ian R

“…Missing outcome data can invalidate the results of randomized trials and their meta-analysis. However, addressing missing data is often a challenging issue…”
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Power and sample-size calculations for trials that compare slopes over time: Introducing the slopepower command Autor Nash, Stephen, Morgan, Katy E, Frost, Chris, Mulick, Amy

“…Trials of interventions that aim to slow disease progression may analyze a continuous outcome by comparing its change over time-its slope-between the treated…”
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cvcrand and cptest: Commands for efficient design and analysis of cluster randomized trials using constrained randomization and permutation tests Autor Gallis, John A, Li, Fan, Yu, Hengshi, Turner, Elizabeth L

“…Cluster randomized trials (CRTs), where clusters (for example, schools or clinics) are randomized to comparison arms but measurements are taken on individuals,…”
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Analysis of partially observed clustered data using generalized estimating equations and multiple imputation Autor Aloisio, Kathryn M, Swanson, Sonja A, Micali, Nadia, Field, Alison, Horton, Nicholas J

“…Clustered data arise in many settings, particularly within the social and biomedical sciences. As an example, multiple-source reports are commonly collected in…”
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The estimation and modelling of cause-specific cumulative incidence functions using time-dependent weights Autor Lambert, Paul C

“…Competing risks occur in survival analysis when an individual is at risk of more than one type of event and the occurrence of one event precludes the…”
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emagnification: A tool for estimating effect-size magnification and performing design calculations in epidemiological studies Autor Miller, David J, Nguyen, James T, Bottai, Matteo

“…Artificial effect-size magnification (ESM) may occur in underpowered studies, where effects are reported only because they or their associated -values have…”
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Application of multiple imputation using the two-fold fully conditional specification algorithm in longitudinal clinical data Autor Welch, Catherine, Bartlett, Jonathan, Petersen, Irene

“…Electronic health records of longitudinal clinical data are a valuable resource for health care research. One obstacle of using databases of health records in…”
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Estimating inverse-probability weights for longitudinal data with dropout or truncation: The xtrccipw command Autor Daza, Eric J, Hudgens, Michael G, Herring, Amy H

“…Individuals may drop out of a longitudinal study, rendering their outcomes unobserved but still well defined. However, they may also undergo truncation (for…”
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Estimation of Multivariate Probit Models via Bivariate Probit Autor Mullahy, John

“…This paper suggests the utility of estimating multivariate probit (MVP) models using a chain of bivariate probit estimators. The proposed approach is based on…”
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