[R] Query in Cuminc - stratification

[kay frances]

Hello everyone, 
 
I am a very new user of R and I have a query about the cuminc function in the 
package cmprsk. In particular I would like to verify that I am interpreting the 
output correctly when we have a stratification variable.
 
Hypothetical example:
 
group : fair hair, dark hair
fstatus: 1=Relapse, 2=TRM, 0=censored
strata: sex (M or F)
 
Our data would be split into:
 
Fair, male, relapse
Dark,male, relapse
Fair, female, relapse
Dark, female, relapse
 
Fair, male, TRM
Dark,male, TRM
Fair, female, TRM
Dark, female, TRM
 
Fair, male, censored
Dark,male, censored
Fair, female, censored
Dark, female, censored
 
Am I correct in thinking that the 2 "Tests" which will be printed by R tell us 
(i) if there are significant differences between those with fair hair and those 
with dark hair as regards cumulative incidence of relapse [taking into account 
sex differences] (ii) if there are significant differences between those with 
fair hair and those with dark hair as regards cumulative incidence of TRM 
[taking into account sex differences] ? The ‘est’and ‘var’values are 
the same regardless of whether we include a stratification variable or not.
 
If we do not include a stratification variable the ‘tests’ results will be 
different to those when a stratification variable is included and they test (i) 
if there are significant differences between those with fair hair and those 
with dark hair as regards cumulative incidence of relapse (ii) if there are 
significant differences between those with fair hair and those with dark hair 
as regards cumulative incidence of TRM.
 
Just thought I’d double check.
Many thanks,
Kim


      
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