, 2004 12:41 AM
Subject: [R] time dependency of Cox regression
Hi,
How can I specify a Cox proportional hazards model
with a covariate which i believe its strength on
survival changes/diminishes with time? The value of
the covariate was only recorded once at the beginning
of the study
array chip wrote:
Hi,
How can I specify a Cox proportional hazards model
with a covariate which i believe its strength on
survival changes/diminishes with time? The value of
the covariate was only recorded once at the beginning
of the study for each individual (e.g. at the
diagnosis of the
Thanks very much for the suggestion. still some
quiestions. In your example of splitting the covariate
into 6 time-dependent covariates (6 records per
person), will the survival time and censored status be
the same for each of the 6 records? If that's the
case, how does the model know that each of
On Wed, 3 Nov 2004, array chip wrote:
Thanks very much for the suggestion. still some
quiestions. In your example of splitting the covariate
into 6 time-dependent covariates (6 records per
person), will the survival time and censored status be
the same for each of the 6 records? If that's the
Hi,
How can I specify a Cox proportional hazards model
with a covariate which i believe its strength on
survival changes/diminishes with time? The value of
the covariate was only recorded once at the beginning
of the study for each individual (e.g. at the
diagnosis of the disease), so I do not
array chip wrote:
Hi,
How can I specify a Cox proportional hazards model
with a covariate which i believe its strength on
survival changes/diminishes with time? The value of
the covariate was only recorded once at the beginning
of the study for each individual (e.g. at the
diagnosis of the
