Hi all~
How does one interpret the following command:
xi: stcox i.mastitis*i.age, robust
this is enquiring the proportional hazard of interaction between age
and mastitis, correct?
So would it be "whether the effect of mastitis increases or decreases
with age.."?
Supposingly, there should be no difference in the order of the
covariates, ie.,
xi: stcox i.mastitis*i.age, robust versus,
xi: stcox i.age*i.mastitis, robust
However, the output is distinctly different. Anyone got comments?
Hope you all had a good and festive New Year's Eve!
Cheers
Lucy
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