Subjects stcox

[Roberto Bakker]

Dear all,

I need to know the sample which was included in the stcox regression - because I want to use this sample for my tables.
In the result I read no. of subjects is 165, included in analysis were 190.
I tried -ereturn list- -stvary, but cannot find it.
My question: how do I identify the regressed sample?

Thank you in advance. Cheers, Roberto

[Marcos Almeida]

Hello Roberto,

Welcome to the Stata Forum,

Please present command and output under CODE delimiters or install the SSC dataex, as recommend in the FAQ.

That said, with missing data, the sample for the regression will be lower. This is the e(sample).

[Carlo Lazzaro]

Roberto:
welcome to the list.
For the future, please act on FAQ, as reminded by Marcos' wise advice.
That said, after -stcox- you can type:

g whoisin=e(sample)
list patientid whoisin

[Roberto Bakker]

Dear Carlo and Marcos,

Thank you for your quick reply. My apologies for not using dataex and/or .

g whoisin=e(sample)

and then

count if whoisin==1 & nvals==1

shows 19 subject, whereas the

stcox

shows 20.
How can this be different?
Cheers Roberto, and thank you in advance

Please find my dataex:
----------------------- copy starting from the next line -----------------------

* Example generated by -dataex-. To install: ssc install dataex
clear
input int id byte tp float qdatet byte dsmt int enterstudy byte gno float(dead nvals) byte(_st _d) double(_t _t0)
 1 0 11729 13 11729 1 0 0 0 .                  .                  .
 1 1 12184  0 11729 1 0 0 1 0 1.2457562150914467                  0
 1 2 12273  0 11729 1 1 1 1 1 1.4894316066148285 1.2457562150914467
 2 0 11729 13 11729 1 0 0 0 .                  .                  .
 2 1 12184 13 11729 1 0 0 1 0 1.2457562150914467                  0
 2 2 12520 13 11729 1 0 0 1 0 2.1656992662358996 1.2457562150914467
 2 3 13248 13 11729 1 0 0 1 0  4.158909210382214 2.1656992662358996
 2 4 13425 13 11729 1 1 1 1 1  4.643522067681524  4.158909210382214
 4 0 11729 13 11729 1 0 0 0 .                  .                  .
 4 1 12186 13 11729 1 0 0 1 0  1.251232066586354                  0
 4 2 12491  8 11729 1 1 1 1 1 2.0862994195597415  1.251232066586354
 6 0 11729 11 11729 1 0 0 0 .                  .                  .
 6 1 12184 11 11729 1 0 0 1 0 1.2457562150914467                  0
 6 2 12617 11 11729 1 1 1 1 1 2.4312780637389113 1.2457562150914467
 8 0 11729  0 11729 1 0 0 0 .                  .                  .
 8 1 12184  2 11729 1 0 0 1 0 1.2457562150914467                  0
 8 2 12234  2 11729 1 1 1 1 1 1.3826525024641332 1.2457562150914467
12 0 11729  8 11729 1 0 0 0 .                  .                  .
12 1 12186  8 11729 1 0 0 1 0  1.251232066586354                  0
12 2 12222  8 11729 1 1 1 1 1 1.3497973934946883  1.251232066586354
13 0 11729  8 11729 2 0 0 0 .                  .                  .
13 1 12186  8 11729 2 0 0 1 0  1.251232066586354                  0
13 2 12520  8 11729 2 0 0 1 0 2.1656992662358996  1.251232066586354
13 3 13247  8 11729 2 0 0 1 0  4.156171284634761 2.1656992662358996
13 4 13710  8 11729 2 0 0 1 0  5.423830905705837  4.156171284634761
13 5 14173  8 11729 2 0 0 1 0  6.691490526776914  5.423830905705837
13 6 15050 15 11729 2 0 0 1 0  9.092651407293834  6.691490526776914
13 7 17984 15 11729 2 1 1 1 1 17.125725550323075  9.092651407293834
17 0 11729  0 11729 1 0 0 0 .                  .                  .
17 1 12212  0 11729 1 1 1 1 1  1.322418136020151                  0
18 0 11729  0 11729 1 0 0 0 .                  .                  .
18 1 12184  6 11729 1 0 0 1 0 1.2457562150914467                  0
18 2 12526 10 11729 1 0 0 1 0  2.182126820720622 1.2457562150914467
18 3 13255 11 11729 1 0 0 1 0   4.17807469061439  2.182126820720622
18 4 13571 15 11729 1 0 0 1 0  5.043259226809769   4.17807469061439
18 5 14171 16 11729 1 0 0 1 0  6.686014675282006  5.043259226809769
18 6 14436 16 11729 1 1 1 1 1  7.411564998357244  6.686014675282006
19 0 11729 10 11729 1 0 0 0 .                  .                  .
19 1 12186  8 11729 1 0 0 1 0  1.251232066586354                  0
19 2 12520 12 11729 1 0 0 1 0 2.1656992662358996  1.251232066586354
19 3 13247 12 11729 1 0 0 1 0  4.156171284634761 2.1656992662358996
19 4 13577 11 11729 1 0 0 1 0 5.0596867812944915  4.156171284634761
19 5 14173 15 11729 1 0 0 1 0  6.691490526776914 5.0596867812944915
19 6 15154 12 11729 1 0 0 1 0  9.377395685029022  6.691490526776914
19 7 15564 12 11729 1 1 1 1 1 10.499945241485051  9.377395685029022
20 0 11617  4 11617 1 0 0 0 .                  .                  .
20 1 11811  4 11617 1 1 1 1 1  .5311575950060234                  0
21 0 11729  4 11729 2 0 0 0 .                  .                  .
21 1 12184  7 11729 2 0 0 1 0 1.2457562150914467                  0
21 2 12520  6 11729 2 0 0 1 0 2.1656992662358996 1.2457562150914467
21 3 13255 10 11729 2 0 0 1 0   4.17807469061439 2.1656992662358996
21 4 13571  8 11729 2 0 0 1 0  5.043259226809769   4.17807469061439
21 5 14171  4 11729 2 0 0 1 0  6.686014675282006  5.043259226809769
21 6 15048 11 11729 2 0 0 1 0  9.087175555798927  6.686014675282006
21 7 18192  9 11729 2 0 0 1 0  17.69521410579345  9.087175555798927
21 8 18852  9 11729 2 1 1 1 1 19.502245099112912  17.69521410579345
23 0 11729 10 11729 1 0 0 0 .                  .                  .
23 1 12325 14 11729 1 0 0 1 0 1.6318037454824226                  0
23 2 12709 12 11729 1 0 0 1 0 2.6831672325046543 1.6318037454824226
23 3 13254 13 11729 1 0 0 1 0  4.175336764866937 2.6831672325046543
23 4 13570 13 11729 1 0 0 1 0  5.040521301062315  4.175336764866937
23 5 14310  . 11729 1 0 0 1 0 7.0665863541780745  5.040521301062315
23 6 15050 14 11729 1 0 0 1 0  9.092651407293834 7.0665863541780745
23 7 18006 14 11729 1 1 1 1 1 17.185959916767057  9.092651407293834
24 0 11729 14 11729 1 0 0 0 .                  .                  .
24 1 12184  3 11729 1 0 0 1 0 1.2457562150914467                  0
24 2 12768  3 11729 1 1 1 1 1 2.8447048516044244 1.2457562150914467
25 0 11729 16 11729 1 0 0 0 .                  .                  .
25 1 12186 17 11729 1 0 0 1 0  1.251232066586354                  0
25 2 12520 21 11729 1 0 0 1 0 2.1656992662358996  1.251232066586354
25 3 13248 15 11729 1 0 0 1 0  4.158909210382214 2.1656992662358996
25 4 13577 17 11729 1 0 1 1 0 5.0596867812944915  4.158909210382214
26 0 11729 10 11729 2 0 0 0 .                  .                  .
26 1 12184  9 11729 2 0 0 1 0 1.2457562150914467                  0
26 2 12193  9 11729 2 1 1 1 1 1.2703975468185302 1.2457562150914467
27 0 11743 15 11743 1 0 0 0 .                  .                  .
27 1 12274 15 11743 1 0 0 1 0   1.45383857189793                  0
27 2 12533 13 11743 1 0 0 1 0  2.162961340488446   1.45383857189793
27 3 13255 16 11743 1 0 0 1 0  4.139743730150038  2.162961340488446
27 4 13576 13 11743 1 0 0 1 0  5.018617895082685  4.139743730150038
27 5 14172 13 11743 1 0 0 1 0  6.650421640565107  5.018617895082685
27 6 15032 12 11743 1 0 1 1 0  9.005037783375315  6.650421640565107
29 0 11743  5 11743 1 0 0 0 .                  .                  .
29 1 12198  0 11743 1 0 0 1 0 1.2457562150914467                  0
29 2 12533  8 11743 1 0 0 1 0  2.162961340488446 1.2457562150914467
29 3 13255  7 11743 1 0 0 1 0  4.139743730150038  2.162961340488446
29 4 13576 11 11743 1 0 0 1 0  5.018617895082685  4.139743730150038
29 5 14172  0 11743 1 0 0 1 0  6.650421640565107  5.018617895082685
29 6 15032  4 11743 1 0 0 1 0  9.005037783375315  6.650421640565107
29 7 18192  6 11743 1 0 1 1 0 17.656883145329097  9.005037783375315
31 0 11743  0 11743 1 0 0 0 .                  .                  .
31 1 12200  0 11743 1 0 0 1 0  1.251232066586354                  0
31 2 12533  0 11743 1 0 0 1 0  2.162961340488446  1.251232066586354
31 3 13254  9 11743 1 0 0 1 0  4.137005804402585  2.162961340488446
31 4 13311  9 11743 1 1 1 1 1  4.293067572007447  4.137005804402585
33 0 11743 11 11743 1 0 0 0 .                  .                  .
33 1 12191 11 11743 1 0 0 1 0 1.2265907348592706                  0
33 2 12702 15 11743 1 0 0 1 0  2.625670791808126 1.2265907348592706
33 3 13248 17 11743 1 0 0 1 0 4.1205782499178625  2.625670791808126
33 4 13711  . 11743 1 0 0 1 0  5.388237870988939 4.1205782499178625
end
format %d qdatet
format %td enterstudy

------------------ copy up to and including the previous line ------------------

Listed 100 out of 100 observations

[Carlo Lazzaro]

Roberto:
I cannot see your -stcox- code, so what follows is basically guess-work.
It may well be that:

...& nvals==1

reduces the number of oservations from 20 to 19.

[Roberto Bakker]

Dear Carlo,

Yes, indeed.
When I tried

distinct id if whoisin==1

I received 20 instead of 19. So, mystery is solved.

Sorry for not mentioning my

stcox

: it was

stcox dsmt gno

.

Best regards,
Roberto