 |
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
Re: st: error message single sample unit
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
---------------------------------------------------------------------
-----
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/