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AgEcon Search 33 records found 1 - 10nextlast  jump to record: Search took 0.10 seconds. 
1.
We present a menu-driven Stata program for the calculation of sample size or power for complex clinical trials with a survival time or a binary outcome. The features supp [...]
2002 | Journal Article |
2.
Royston and Babiker (2002) presented a menu-driven Stata program for the calculation of sample size or power for complex clinical trial designs under a survival time or b [...]
2005 | Journal Article |
3.
We present menu- and command-driven Stata programs for the calculation of sample size, number of events, and trial duration for a novel type of clinical trial design with [...]
2009 | Journal Article |
4.
We present an extension of Sasieni, Royston, and Cox’s bivariate smoother running to the multivariable context. The software aims to provide a picture of the relation b [...]
2005 | Journal Article |
5.
A new set of tools is described for performing analyses of an ensemble of datasets that includes multiple copies of the original data with imputations of missing values, [...]
2008 | Journal Article |
6.
We consider how to represent sigmoid-type regression relationships in a practical and parsimonious way. A pure sigmoid relationship has an asymptote at both ends of the r [...]
English | 2014 | Journal Article |
7.
Assessing the instability of a multivariable model is important but is rarely done in practice. Model instability occurs when selected predictors—and for multivariable [...]
2009 | Journal Article |
8.
This article introduces a new measure of explained variation for use with censored survival data. It is a modified version of a measure previously described by John O’Q [...]
2006 | Journal Article |
9.
Since its introduction to a wondering public in 1972, the Cox proportional hazards regression model has become an overwhelmingly popular tool in the analysis of censored [...]
2001 | Journal Article |
10.
Royston (2001) and Royston and Parmar (2002) introduced flexible parametric models for survival analysis, implemented in Stata through the ado-file stpm (Royston 2001). I [...]
2004 | Journal Article |

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