[R] Survival

From: Marco Tasin <marco.tasin_at_vv.slu.se>
Date: Tue 03 May 2005 - 18:30:15 EST


Dear list,

I made survival analysis using Weibull regression.

I got significance in the analysis:

>anova(m1)

Df Deviance Resid. Df    -2*LL     P(>|Chi|)
NULL  NA       NA      2158 4933.109            NA
tratt -8 577.0669      2150 4356.042 1.988317e-119

and

> summary(m1)

Call:
survreg(formula = Surv(tempo, sensore) ~ tratt)

             Value Std. Error         z        p
(Intercept)  3.615   9.01e-02  40.12195 0.00e+00
tratti       9.610   1.07e+03   0.00898 9.93e-01
trattma      0.692   1.92e-01   3.60420 3.13e-04
trattme      0.505   1.67e-01   3.03168 2.43e-03
tratts      -0.211   1.11e-01  -1.90080 5.73e-02
trattt      -0.916   9.85e-02  -9.29575 1.46e-20
trattte      0.132   1.31e-01   1.01251 3.11e-01
trattth     -0.688   9.97e-02  -6.90145 5.15e-12
trattv      -0.192   1.12e-01  -1.71203 8.69e-02
Log(scale)  -0.674   3.54e-02 -19.04990 6.58e-81

Scale= 0.51

but I do not know how to check if the treatments are different from each other: shall I group them?

Thank you for your attention,

Marco

==========================================

Marco Tasin
Chemical Ecology Group

Current Address:
Swedish University of Agricultural Sciences Dep. of Crop Sciences
Tel. +46 40 415306 Secretary +46 40 415301

Box 44 S-230 53 Alnarp
Sweden

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