G. KOÇTÜRK - LFS Sample Design, Allocation, Weighting

TURKISH STATISTICAL INSTITUTE

Sampling and Analysis Techniques DepartmentSurvey Design Group 20/05/14

OUTLINE

Gökhan KOÇTÜRK

TURKSTAT ExpertSampling & Analysis Techniques Department



Sampling Frame

Cluster (100 households on average)

Sampling Unit

Estimation Level (NUTS 2 annually, Urban-Rural quarterly)

Stratification



Rotational Design

8 Subsamples

%50 overlap between consecutive quarters

%50 overlap between the same quarters of consecutive years



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)



2013 2014 2015Subsample 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 A13 B B A A B B A14 B B A A B B15 B B A A B16 B B A A17 B B A18 B B19 B



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



Sample size calculation;

where;

t: %95 significance levelp: rate of characteristicsq: 1-pd: degree of precisionH: number of strata

Hd

deffqptn *

***2

2

=



Article 3(1) and 3(2) is followed for sample size calculation



Uniform Distribution Among Weeks

* Adana – Urban

* Turkey – Total



Design Weights



Nonresponse Adjustment

* Adjusted weight;

iinr rww *=



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

ki w

wDp

*



Integrative Calibration

* If Dk=1 :

* If Dk=0;

* : weighted Dk values(for all ind. in hh within related group)

oldIk

i

iIk w

p

Pw )()( *=

oldIIk

i

i

ii

IIk w

a

p

Pa

w )()( *1

*1

−

−

=

ia



Trimming

* : average calibrated weights for household

Lw

w

Lk ≤≤1

w



Final Correction

* Final weights ;

Fww kfinal *=



(-) 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)



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G. KOÇTÜRK - LFS Sample Design, Allocation, Weighting

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