The document discusses the Czech Statistical Office's approach to sampling for its monthly labor force survey. It uses a two-stage sampling method, first selecting census areas and then dwellings within those areas. The sampling is distributed monthly and quarterly using a rotation scheme. Analysis shows unemployment and employment rates vary more between urban and rural areas than between municipality sizes. The monthly sample has little overlap, so regression models are used to increase stability of short-term estimates. Recommendations focus on balancing rotation flexibility with ensuring distribution of areas over time and by degree of urbanization.

1. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 1/16
Ondřej Nývlt, Ilona Nováková, Lukáš Savko
EFFECTIVE DISTRIBUTION OF
SAMPLE OVER TIME AS WELL AS
OVER SPACE WITH RELATION TO
MONTHLY PROCESSING IN THE
CZECH REPUBLIC

2. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 2/16
Sampling frame - the register of inhabited dwellings (Census Area
Register), no relation to register of persons in case of the Czech
Republic – law restriction
Sampling method – two stages:
 1st stage – randomized systematic sample of Census Areas in
NUTS4 (probability of inclusion proportional to number of permanently
inhabited dwellings in C.A.)
 2nd stage – random sample of selected dwellings
 Fixed distribution according to size of municipalities in NUTS4
SAMPLING FRAME PROCEDURE

3. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 3/16
■ In particular quarters the scheme of Census areas according to the NUTS4
and reference weeks
■ The size of municipality or degree of urbanisation are not a part of rotation
scheme
■ The rotation scheme is not strictly given, is adapted according to demand of
field workers (fieldwork strategy)
Rules and checks for rotation scheme
■ to check the minimum and maximum of surveyed census areas
according to reference weeks and NUTS4 or NUTS3 or to compute
dispersion
■ in repeated visits in the households the possibility to switch the reference
weeks +1
■ Evaluation – feedback, reports
ROTATION SCHEME

4. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 4/16
ROTATION SCHEME – ALLOCATION OF CENSUS AREAS
550
650
400
400
300
400
300
300
300
300
550
300
300
600
5650
13
43
50
31
30
24
30
23
23
23
23
43
23
23
46
435
12
43
50
31
30
23
31
23
23
23
23
43
23
23
46
435
11
43
50
31
31
23
30
23
23
23
23
42
23
23
46
434
10
42
50
31
31
23
31
23
23
23
23
42
23
24
46
435
9
42
50
31
31
23
31
23
23
23
23
42
23
23
46
434
8
42
50
30
31
23
31
23
23
24
23
42
23
23
47
435
7
42
50
30
31
23
31
23
24
23
23
42
23
23
47
435
6
42
50
31
31
23
31
23
23
23
23
42
23
23
46
434
5
42
50
31
31
23
31
23
23
23
24
42
23
23
46
435
4
42
50
30
31
23
31
24
23
23
23
42
23
23
46
434
3
42
50
31
30
23
31
23
23
23
23
43
24
23
46
435
2
42
50
31
31
23
31
23
23
23
23
43
23
23
46
435
1
43
50
31
31
23
30
23
23
23
23
42
23
23
46
434
hl.m.Praha
Středočeský
Jihočeský
Plzeňský
Karlovarský
Ústecký
Liberecký
Královéhradecký
Pardubický
Vysočina
Jihomoravský
Olomoucký
Zlínský
Moravskoslezský
ČR celkem
NUTS 3 Total
Reference weeks (1
st
quarter)

5. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 5/16
ROTATION SCHEME – REAL ALLOCATION OF
CENSUS AREAS
EXAMPLE
2 3 4 5 6 7 8 9 10 11 12 13
.
5101 51 70 6 5 5 6 5 6 6 5 5 5 6 5 5 0,24 1
5102 51 65 5 5 5 5 5 5 5 6 5 5 5 5 4 0,15 2
5103 51 111 8 9 8 9 9 8 8 9 9 8 8 9 9 0,25 1
5104 51 54 4 4 5 4 4 4 4 4 4 5 4 4 4 0,13 1
51 300 23 23 23 24 23 23 23 24 23 23 23 23 22 0,22 2
5201 52 89 6 7 8 7 7 7 6 7 6 7 7 7 7 0,28 2
5202 52 45 4 4 3 3 4 4 2 4 4 3 4 3 3 0,40 2
5203 52 64 5 6 4 5 6 5 6 4 6 4 4 4 5 0,69 2
5204 52 45 4 2 3 4 3 3 4 4 4 3 4 4 3 0,40 2
5205 52 57 4 4 5 4 3 4 6 4 3 6 4 5 5 0,85 3
52 300 23 23 23 23 23 23 24 23 23 23 23 23 23 0,07 1
5301 53 61 4 4 4 5 5 4 4 4 5 5 5 6 6 0,52 2
5302 53 98 7 7 9 7 7 9 8 8 7 7 8 7 7 0,56 2
5303 53 69 6 6 5 6 5 5 5 6 5 5 5 5 5 0,21 1
5304 53 72 6 6 5 5 6 5 6 6 6 6 5 5 5 0,25 1
53 300 23 23 23 23 23 23 23 24 23 23 23 23 23 0,07 1
.
Total 5650 434 435 435 435 433 434 436 437 433 435 435 435 433 1,31 4
Dispersion Max-min
Allocation of census areas accoding to NUTS4 - 2013q4
Reference weeks
NUTS4 NUTS3 Total CA

6. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 6/16
■ Reference months in quarterly distribution (4-5-4)
■ How to ensure regular distribution of census areas
according to size of municipality or degree of urbanization
to particular months?
■ Problems with remote municipalities in the wintertime
■ In the Czech Republic only recommendation in case for
size of municipality for fieldwork – is it sufficient?
MONTHLY ALLOCATION OF CENSUS AREAS

7. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 7/16
ROTATION SCHEME
REAL ALLOCATION OF CENSUS AREAS ACCORDING TO DEGREE
OF URBANIZATION – 2013Q1
1 2 3 4 5 6 7 8 9 10 11 12 13
.
52 Total 300 23 23 23 23 23 23 23 24 23 23 23 23 23 0,07 1
Densely 54 5 6 4 5 4 2 4 6 3 1 5 3 6 2,28 5
Intermediate 120 8 9 11 13 6 9 6 12 9 11 8 7 11 4,64 7
Thinly 126 10 8 8 5 13 12 13 6 11 11 10 13 6 7,44 8
53 Total 300 23 23 23 23 23 24 23 23 23 23 23 23 23 0,07 1
Densely 30 3 1 2 0 4 2 1 0 1 4 4 4 4 2,37 4
Intermediate 114 9 9 7 8 6 7 11 10 9 7 11 10 10 2,49 5
Thinly 156 11 13 14 15 13 15 11 13 13 12 8 9 9 4,77 7
.
NUTS3
Degree of
urbanization
Number
of CA
Reference week
Dispersion Max-min

8. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 8/16
ROTATION SCHEME
REAL ALLOCATION OF CENSUS AREAS ACCORDING TO SIZE OF
MUNICIPALITY (IN PERSONS)– 2013Q1
1 2 3 4 5 6 7 8 9 10 11 12 13
.
52 Total 300 23 23 23 23 23 23 23 24 23 23 23 23 23 0,07 1
0-999 72 6 4 5 3 8 7 6 5 7 7 5 5 4 1,94 5
1000-9999 90 5 6 6 5 8 7 9 3 6 12 7 12 4 6,99 9
10000-49999 84 7 7 8 10 3 7 4 10 7 3 6 3 9 5,94 7
50000+ 54 5 6 4 5 4 2 4 6 3 1 5 3 6 2,28 5
53 Total 300 23 23 23 23 23 24 23 23 23 23 23 23 23 0,07 1
0-999 90 10 11 9 6 5 10 6 6 7 7 4 4 5 5,15 7
1000-9999 94 2 4 7 12 10 7 11 10 9 5 6 6 5 8,18 10
10000-49999 86 8 7 5 5 4 5 5 7 6 7 9 9 9 2,85 5
50000+ 30 3 1 2 0 4 2 1 0 1 4 4 4 4 2,37 4
.
NUTS3
Size of
municipality
Number
of CA
Reference week
Dispersion Max-min

9. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 9/16
■ Great differences in unemployment rates
■ City environment brings the working opportunities
ANALYSIS OF UNEMPLOYMENT ACCORDING TO
DEGREE OF URBANIZATION
The unemployment rate, age group 15-74 years (%) in the Czech Republic (2011-2013)

10. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 10/16
■ Relatively low unemployment in the small municipalities (below 1 thousand
residents)
ANALYSIS OF UNEMPLOYMENT ACCORDING TO
SIZE OF MUNICIPALITY
The unemployment rate, age group 15-74 years (%) in the Czech Republic (2011-2013)

11. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 11/16
■ In the last two years the growth of unemployment rate in cities
ANALYSIS OF EMPLOYMENT ACCORDING TO
REGIONAL STRUCTURE
The employment rate, age group 15-74 years (%) according to degree of
urbanization in the Czech Republic (2011-2013)

12. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 12/16
Quarterly sample – approximately 80 % overlapping from quarter
to quarter and 20 % overlapping from year to year
Monthly sample – mostly zero overlapping from month to month,
higher stability in comparison m and m+3 – 80 % overlapping
Result – in monthly processing, it is not suitable to use monthly
raw data (using of Regression Estimation Model in the Czech
Republic)
STABILITY OF THE SAMPLE IN THE MONTHLY PROCESSING

13. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 13/16
■ Average of absolute differences for the mentioned period is 0,5 for month to
month comparison and 0,4 for month to month+3 comparison
STABILITY OF THE SAMPLE IN THE MONTHLY PROCESSING
The absolute differences (in percentage points) in rate of unemployment in the
Czech Republic (2012-2013)

14. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 14/16
■ Average of absolute differences for the mentioned period is 0,6 for month to
month comparison and 0,4 for month to month+3 comparison
STABILITY OF THE SAMPLE IN THE MONTHLY PROCESSING
The absolute differences (in percentage points) in rate of employment in the Czech
Republic (2012-2013)

15. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 15/16
■ What is better indicator for regional details, generally?
■ Size of municipality
■ Degree of urbanization
■ The strict rotation scheme versus recommendation
■ Recommendation - checks, report, feedback from LFS experts
■ Strict scheme – maybe higher financial expenses
■ Is it possible to have the urban x rural distribution of census areas
according to reference weeks?
■ Can any regression model ensure the stability of monthly results?
CONCLUSION

16. CZECH STATISTICAL OFFICE | Na padesátém 81, 100 82 Prague 10 | czso.cz 16/16
Thank you for your attention