Message-ID: <993034.79903.qm@web62006.mail.re1.yahoo.com>
Date: 2009-11-13T08:17:04Z
From: carol white
Subject: survreg function in survival package
Hi,
Is it normal to get intercept in the list of covariates in the output of survreg function with standard error, z, p.value etc? Does it mean that intercept was fitted with the covariates? Does Value column represent coefficients or some thing else?
Regards,
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tmp = survreg(Surv(futime, fustat) ~ ecog.ps + rx, ovarian, dist='weibull',scale=1)
> summary(tmp)
Call:
survreg(formula = Surv(futime, fustat) ~ ecog.ps + rx, data = ovarian,
dist = "weibull", scale = 1)
Value Std. Error z p
(Intercept) 6.962 1.322 5.267 1.39e-07
ecog.ps -0.433 0.587 -0.738 4.61e-01
rx 0.582 0.587 0.991 3.22e-01
Scale fixed at 1
Weibull distribution
Loglik(model)= -97.2 Loglik(intercept only)= -98
Chisq= 1.67 on 2 degrees of freedom, p= 0.43
Number of Newton-Raphson Iterations: 4
n= 26