Book Image

Data Analysis with STATA

Book Image

Data Analysis with STATA

Overview of this book

Table of Contents (16 chapters)
Data Analysis with Stata
About the Author
About the Reviewers

Building a model

In order to build a model, we will incorporate all regular predictors as well as predictors that have a lesser value of p (0.3-0.35). As methodux consists of three steps, the preceding predictor will be incorporated along with a dummy variable as well as methodux1 as a reference. A dummy variable can be formed through the xi command with Toxiq:

Toxiq age metfordrug j.sets 1.metho, Lsssdzc

Fail_c: patient response
Analysis_tm: time

Iteration 0: log Likelihood = - 38645.678, Iteration 1: log Likelihood = -38546.876
Iteration 2: log Likelihood = -38546.956, Iteration 3: log Likelihood = -38546.567

Refined estimate: Iteration 0: Log Likelihood  = -38456,567

Cox regression -- Breslow method
Total subjects- 520
Total observations – 520
Failures – 294
Risk time – 13259
Log likelihood - -38456.567        LRRRchiiirl(3) – 36.90
                                   Prob> chiiiir(3) = 0



Standard Error


P> !y!

[ 93% Conff interval]