Re: st: Spline after Cox regression

[Nick Cox <njcoxstata@gmail.com>]

So, -adjust- is evidently objecting to being asked to do something 1064 times.

Nick
njcoxstata@gmail.com

Etan Lakam

> Thanks Nick for your reply
> Yes lnffa is the variable I intended to use, it  has 1064 distinct values.

Nick Cox

>>> How many distinct values does -lnffa- have? Was that the variable you
>>> meant to use?

Etan Lakam

>>> > I am doing Cox-regression with a continuous exposure ffa and the
>>> > outcome hf, I have been trying to model it as  cubic spline.
>>> > Here is how I approached it, adjusting for age, sex, and race, however
>>> > it is coming up with the message error below, and I cannot obtain the
>>> > graph
>>> > I do not have a clue about what is happening.

>>> > mkspline  rlnffa= lffa, cubic nknots(5)
>>> > stcox rlnratio* sex race age
>>> > adjust race=0 sex=1 age, by(lnffa) ci replace exp
>>> >
>>> > ------------------------------------------------------------------------------------------
>>> >      Dependent variable: _t     Command: stcox
>>> >    Variables left as is: rlnffa1, rlnffa2
>>> >   Covariate set to mean: age = 53.900191
>>> > Covariates set to value: race = 0, sex = 1
>>> >
>>> > ------------------------------------------------------------------------------------------
>>> > too many values
>>> > r(134);
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