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Re: st: error message single sample unit


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: error message single sample unit
Date   Mon, 1 Sep 2008 09:13:36 -0400


Sahid--

I think your most serious problem may not be single unit strata, but that only 81 of 19,474 observations have non-missing values for variable sd107f. What is this variable? Is it coded correctly? Is it defined only for a sub-population? If so, then the advice I gave earlier is not sufficient. You must also add the -subpop- option to the survey estimation commands.

For example, suppose I want to estimate the percent of cigarette smokers who inhale deeply. My variable "inhale" is defined only for smokers and is missing for all others; smoking is indicated by variable smoke (=1 for yes = 2 for no). Then my subpop option would look like:

svy, subpop(if smoke==1): mean inhale


-Steve

On Aug 31, 2008, at 10:04 AM, Steven Samuels wrote:


Sahid-

I don't understand your question. I see two options, neither of which is difficult.

1. In -svyset-, set the -singleunit- option to something other than the default "missing". I suggest singleunit(centered). This setting will apply to analyses of other variables with single units.

2. Create a new stratum variable for the analysis of sd107f by merging single unit strata to adjacent ones. This assumes that strata with adjacent numbers are "near" each other in some physical sense.

For example:

gen st_sd107f = v012 //your stratum
recode st_sd107f 19=20 27=28 29=30 etc.

Then prior to analyses of this sd107f, -svset- your data again with the new stratum variable.

-Steve

On Aug 30, 2008, at 4:46 PM, Sahid Hocine wrote:


Dear All,
Running a svylogit am confronted with that message which seems easy
to solve looking at the stata help. I used -svydes- however i have
load of observations to reassign. Is theere an easier than- list- way
to do so?

Thanks

--------------------------------------------------------------------- -----------------
svydes sd107f

Survey: Describing stage 1 sampling units

pweight: weight
VCE: linearized
Single unit: missing
Strata 1: v012
SU 1: v021
FPC 1: <zero>

#Obs with #Obs with #Obs per included Unit
#Units #Units complete missing ----------------------------
Stratum included omitted data data min mean max
-------- -------- -------- -------- -------- -------- -------- --------
15 0 12 0 12 0 0 0
16 0 55 0 63 0 0 0
17 0 119 0 151 0 0 0
18 0 205 0 265 0 0 0
19 1* 248 1 366 1 1.0 1
20 1* 321 1 481 1 1.0 1
21 0 320 0 483 0 0 0
22 4 388 4 656 1 1.0 1
23 2 399 2 693 1 1.0 1
24 7 413 7 681 1 1.0 1
25 4 482 4 980 1 1.0 1
26 4 439 4 743 1 1.0 1
27 1* 402 1 679 1 1.0 1
28 4 415 4 711 1 1.0 1
29 1* 412 1 653 1 1.0 1
30 2 445 2 783 1 1.0 1
31 2 378 2 613 1 1.0 1
32 3 396 3 635 1 1.0 1
33 2 381 2 597 1 1.0 1
34 2 358 2 550 1 1.0 1
35 2 458 2 849 1 1.0 1
36 2 365 2 563 1 1.0 1
37 1* 383 1 598 1 1.0 1
38 6 386 6 608 1 1.0 1
39 6 364 6 551 1 1.0 1
40 2 447 2 771 1 1.0 1
41 1* 330 1 497 1 1.0 1
42 4 381 4 585 1 1.0 1
43 4 341 4 510 1 1.0 1
44 3 322 3 450 1 1.0 1
45 2 444 2 757 1 1.0 1
46 2 302 2 413 1 1.0 1
47 1* 316 1 448 1 1.0 1
48 2 352 2 519 1 1.0 1
49 3 312 3 479 1 1.0 1
-------- -------- -------- -------- -------- -------- -------- --------
35 81 12091 81 19393 1 1.0 1
------------------
19474


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