Displaying 3 results from an estimated 3 matches for "zhixin".
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zhilin
2008 Dec 15
5
how to create duplicated ID in multi-records per subject dataset
...D record
1 20
1 30
1 25
2 26
2 15
3 21
4.....................
That is, I have to duplicate IDs for those with multiple records. I am wondering it is possible to be done in R, and I am grateful if you would like to show me the direction.
Many thanks!
Zhixin
2008 Nov 11
1
using newdata in survfit with categorical variable
..., newdata=temp)
Then I got error message:
Error in `contrasts<-`(`*tmp*`, value = "contr.treatment") :
contrasts can be applied only to factors with 2 or more levels
I do not know what this error message indicates, do I have to recode gender to 0,1 to get it through?
Many thanks
Zhixin
2004 Jun 14
1
olesolve: stepsize
Hi,
I am doing a project on the simulation of glucose metabolism based on a
pharmacokinetic modeling in which we have 4 differential equations. I did
this in R by using the odesolve package. It works very well, but I have two
questions:
Here is the odemodel function
_________________________________________________
Ogtt.Odemodel <- function(t, y, p) {
absx <- c(-60, -45, -30,