9th Workshop on Labour Force Survey Methodology. Roma, 15-16 maggio 2014

1. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
OUTLINE
Gökhan KOÇTÜRK
TURKSTAT Expert
Sampling & Analysis Techniques Department

2. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Sampling Frame
 Cluster (100 households on average)
 Sampling Unit
 Estimation Level (NUTS 2 annually, Urban-Rural quarterly)
 Stratification

3. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Rotational Design
 8 Subsamples
 %50 overlap between consecutive quarters
 %50 overlap between the same quarters of consecutive years

4. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 2 - 2 - 2 design is used
 Around 44.000 households per quarter
 550 clusters (10 hh selected from each) for each subsample
 Each week is reference week (52 per year)

5. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
2013 2014 2015
Subsample 1 2 3 4 1 2 3 4 1 2 3 4
1 A
2 A A
3 B A A
4 B B A A
5 A B B A A
6 A A B B A A
7 B A A B B A A
8 B B A A B B A A
9 B B A A B B A A
10 B B A A B B A A
11 B B A A B B A A
12 B B A A B B A A
13 B B A A B B A
14 B B A A B B
15 B B A A B
16 B B A A
17 B B A
18 B B
19 B

6. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
General Comparison;
Existing LFS Continous LFS
Reference week 12 per year 52 per year
Sample Size 42000 per quarter 44000 per quarter
No. Of Clusters 353 550
Regulation Article 3.1 Article 3.1 + Article 3.2

7. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
Sample size calculation;
where;
t: %95 significance level
p: rate of characteristics
q: 1-p
d: degree of precision
H: number of strata
H
d
deffqpt
n *
***
2
2
=

8. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Article 3(1) and 3(2) is followed for sample size calculation

9. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Article 3(1) and 3(2) is followed for sample size calculation

10. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Uniform Distribution Among Weeks
* Adana – Urban
* Turkey – Total

11. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
Design Weights

12. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Nonresponse Adjustment
* Adjusted weight;
iinr rww *=

13. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Integrative Calibration
* D : Dummy variable for related group
* Wk : Weights after non response adjustment
* pi : weighted sample proportion for related group (for ex. Male)
* Pi : Population proportion for related group
∑
∑=
k
k
i
w
wD
p
*

14. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Integrative Calibration
* If Dk=1 :
* If Dk=0;
* : weighted Dk values(for all ind. in hh within related group)
oldI
k
i
iI
k w
p
P
w )()(
*=
oldII
k
i
i
i
i
II
k w
a
p
P
a
w )()(
*
1
*1
−






−
=
ia

15. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Trimming
* : average calibrated weights for household
L
w
w
L
k
≤≤
1
w

16. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
 Final Correction
* Final weights ; Fww kfinal *=

17. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
(-) Changing too many things at the same time
(Changes in methodology & application)
(-) Difficulties in Field Application
(+) Sample Size Calculation & Distribution
(using CV, household size, nonresponse rate from previous years)
(+) Better results (because of 52 reference weeks)
(+) Calibration (Hhsize)

18. TURKISH STATISTICAL INSTITUTE
Sampling and Analysis Techniques Department
Survey Design Group 20/05/14
gokhankocturk@tuik.gov.tr