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Re: st: Re: limiting observations within a program
Thanks for confirming `X', and also for pointing out the nifty abbreviations!
Now, if I could only figure out why adding the -if- statement to my
-stcox- command:
stcox tcm if `wt_stab_ALL'!=.
or dropping the very with missing weight with:
drop if `wt_stab_ALL' ==.
will cause the bootstrapping of my program to give the error message:
"varlist required
an error occurred when bootstrap executed msmcox_stageALL_includeIPTWd
r(100);"
Michael
Ok, so indeplist is a user-written program. This works for me, i.e.
leaves the desired result in the -return list-
*************
cap ssc inst indeplist
webuse kva, clear
stset failtime
cap pr drop myprog
pr myprog, rclass
indeplist, local
foreach var of varlist `X' {
return scalar `var' = exp(_b[`var'])
}
end
stcox load bearings
myprog
ret li
**************
HTH
Martin
_______________________
----- Original Message ----- From: "Michael McCulloch" <[email protected]>
To: <[email protected]>
Sent: Friday, October 03, 2008 2:24 AM
Subject: Re: st: Re: limiting observations within a program
Martin wrote:
`X' looks like some kind of -macro- but I cannot find its
definition, either...
Ahah! Thank you. Now I know what proper question to ask. Let me try
this again. Note that the section mentioning X:
" indeplist, local
foreach var of varlist `X' {
return scalar `var' = exp(_b[`var'])
}"
immediately follows the -stcox-. What I want to do is to have it
give me the exponentiated coefficient so the hazard ratio is
returned. How would I rewrite that section to do this?
HTH
Martin
_______________________
----- Original Message ----- From: "Michael McCulloch" <[email protected]>
To: <[email protected]>
Sent: Friday, October 03, 2008 2:12 AM
Subject: Re: st: Re: limiting observations within a program
Sergei wrote:
And where is varlist X defined?
Thanks Sergei. Sorry, not sure what you mean. I've defined the
tempnames with:
tempname p_tcm_ALL p_notcm_ALL p_ALL p_noALL wt_stab_ALL
And, the variables are all within my dataset:
tcm dxage sex celltype txsurg txrad txchemo
On Thu, Oct 2, 2008 at 7:56 PM, Michael McCulloch <[email protected]> wrote:
Thanks Martin. This is my program. It first estimates probability of
receiving treatment (called "tcm"), and then weights the data
for -stcox-.
There was one observation in which the weight was missing, I'm
attempting to
include a line in my program to drop that one observation.
capture program drop msmcox_stageALL_includeIPTWd
program define msmcox_stageALL_includeIPTWd, rclass
> tempname p_tcm_ALL p_notcm_ALL p_ALL p_noALL
> wt_stab_ALL
* fit the full model used in Traditional Cox
> logit tcm dxage sex celltype txsurg txrad txchemo
*estimate probability of treatment
predict `p_tcm_ALL'
gen `p_notcm_ALL' = 1-`p_tcm_ALL' if tcm==0 //want p(tcm) for
both users and nonusers
replace `p_tcm_ALL' =`p_notcm_ALL' if tcm==0
*create stabilized weight==P(A)/P(A|W)
logit tcm predict `p_ALL'
gen `p_noALL' = 1-`p_ALL' if tcm==0
replace `p_ALL' = `p_noALL' if tcm==0
gen `wt_stab_ALL' = `p_ALL'/`p_tcm_ALL'
* stset the data
stset lastcontact [`iweight=wt_stab_ALL'], failure(failed)
origin(datedx) scale(30.4375) /*wt: stabilized IPTW*/
* cox
stcox tcm if `wt_stab_ALL'!=.
indeplist, local
foreach var of varlist `X' {
return scalar `var' = exp(_b[`var'])
}
end set seed 12358
eststo MSM_t_I: bootstrap tcm=r(tcm), eform reps(10):
msmcox_stageALL_includeIPTWd
That is too little info. How does `var1' come into existence? A
-bootstrap- would cycle through the -program- several times,
so that is an
important issue. Also -set trace on- and let us know the output...
HTH
Martin
_______________________
----- Original Message ----- From: "Michael McCulloch" <[email protected]>
To: "Statalist" <[email protected]>
Sent: Friday, October 03, 2008 1:10 AM
Subject: st: limiting observations within a program
Hello,
I've written a short program which estimates a probability
of censoring,
and have a question. The program works as written, but if I add the
following line:
drop if `var1'==.
the program returns error message:
"varlist required an error occurred when bootstrap executed program1
r(100);"
Any assistance would be appreciated!
--
Best wishes,
Michael McCulloch
Pine Street Foundation
124 Pine St., San Anselmo, CA 94960-2674
Tel: (415) 407-1357
Fax: (415) 485-1065
[email protected]
www.pinestreetfoundation.org
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