Published by the Foundation for Open Access Statistics Editors-in-chief: Bettina Grün, Torsten Hothorn, Edzer Pebesma, Achim Zeileis    ISSN 1548-7660; CODEN JSSOBK
Authors: Walter Schill, Dirk Enders, Karsten Drescher
Title: A SAS Package for Logistic Two-Phase Studies
Abstract: Two-phase designs, in which for a large study a dichotomous outcome and partial or proxy information on risk factors is available, whereas precise or complete measurements on covariates have been obtained only in a stratified sub-sample, extend the standard case-control design and have been proven useful in practice. The application of two-phase designs, however, seems to be hampered by the lack of appropriate, easy-to-use software. This paper introduces sas-twophase-package, a collection of SAS-macros, to fulfill this task. sas-twophase-package implements weighted likelihood, pseudo likelihood and semi- parametric maximum likelihood estimation via the EM algorithm and via profile likelihood in two-phase settings with dichotomous outcome and a given stratification.

Page views:: 2488. Submitted: 2012-11-06. Published: 2014-04-22.
Paper: A SAS Package for Logistic Two-Phase Studies     Download PDF (Downloads: 2411)
Supplements:
sas-twophase-package.zip: Download (Downloads: 261; 376KB)
v57i09.sas: Download (Downloads: 334; 3KB)

DOI: 10.18637/jss.v057.i09

by
This work is licensed under the licenses
Paper: Creative Commons Attribution 3.0 Unported License
Code: GNU General Public License (at least one of version 2 or version 3) or a GPL-compatible license.