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Re: st: Spline after Cox regression
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Spline after Cox regression
Date
Sun, 7 Jul 2013 07:19:04 +0100
So, -adjust- is evidently objecting to being asked to do something 1064 times.
Nick
[email protected]
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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