1. An example of longitudinal LFS weights
Division for general methodology and standards

2. LFS panel sample sizes (number of households) for the years 2012 and 2013
Part Q1 Q2 Q3 Q4
2012/1
2397
1583
1138
997
874
2012/2
2412
1527
1161
972
840
2012/3
2388
1478
1143
995
877
2012/4
2461
1581
1252
1037
2013/1
2474
1611
1226
2013/2
2491
1660
1263
2013/3
2483
1638
2013/4
2473
annual overlap
quarterly overlap

3. Data collection First wave – CAPI
Repeated waves – (predominantly) CATI
Nonresponding households from previous quarters are not included in the panel sample
Response rate: in first wave – 66%;
in repeated waves – 83%
Average households size for responding households ~ 2,75 members

4. Number of responding individuals
Year
2012
2013
Part Q1 Q2 Q3 Q4
2012/1
4498
3152
2752
2456
2204
2012/2
4360
3227
2686
2316
2163
2012/3
4167
3136
2767
2451
2214
2012/4
4318
3417
2858
2511
2013/1
4308
3308
2916
2013/2
4529
3507
2981
2013/3
4449
3455
2013/4
4330
annual overlap
= 2725
quarterly overlap
= 8586

5. Number of responding individuals – 15 years +
2012
2013
Part Q1 Q2 Q3 Q4
2012/1
3887
2715
2385
2123
1909
2012/2
3809
2826
2346
2026
1895
2012/3
3638
2723
2404
2137
1919
2012/4
3794
2991
2505
2209
2013/1
3751
2866
2533
2013/2
3934
3022
2563
2013/3
3937
3037
2013/4
3779
annual overlap
= 4128
quarterly overlap
= 7450

6. Non-response distribution of the longitudinal sample – 3rd to 4th quarter 2013
2012Q3 / 2012Q4
Households %
2nd wave
3rd wave
5th wave
Sample
3769
1641
1252
876
Ineligible 3
0,1%
0,0%
Response
3135
83,2%
77,2%
85,0%
91,8%
Nonresponse
631
16,8%
22,7%
14,9%
8,2%
- Refusals
425
67,4%
65,6%
71,7%
65,3%
- Noncontacts 84
13,3%
14,8%
11,2%
11,1%
- Other
122
19,3%
19,6%
17,1%
23,6%

7. Attrition by selected relevant characteristics of the household (completion rate)

8. Weighting steps
Cross-sectional design weights (on strata and wave level)
Cross-sectional non-response weghts (on strata and wave level)
Longitudinal non-response wave (on strata level, to response statuses at the final quarter)
Grossing up to population total (wave level)
Calibration to demographic data (all data together, to first quarter situation)
Calibration to main employment statuses (all data together, to first quarter situation)
+ Calibration to demographic data (all data together, to first quarter situation)
+ Calibration to main employment statuses (all data together, to first quarter situation)

9. Longitudinal population Q – Q (July 1st 2013 vs. Oct 1st 2013)
3th quarter 2013
3th and 4th quarter 2013
4th quarter 2013
Male
Female
years
years
65 years +
Total

10. Longitudinal population Y – Y (Oct 1st 2012 vs. Oct 1st 2013)
4th quarter 2012
4h quarter 2012 and 2013
4th quarter 2013
Male
Female
years
years
65 years +
Total

11. Basic descriptive statistics for the Q – Q longitudinal weight, compared to standard quarterly weight, 3rd quarter 2013 n
mean
stddev
min q1 q3
max
population
W_LONG13q3
8.534
241,28
165,47
14,28
139,87
290,16
1.675,99
W_CROS13q3
15.486
132,97
90,25
10,79
76,44
159,86
1.100,41

12. Changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter – using longitudinal weight
2013Q3 / 2013Q4
Unemloyed
Employed
Inactive
Population under 15
in 1000 %
Unemployed 48 50 22 23 26 27 13 1
865 94 45 5 21 3 6
677 91 4
294 99

13. Changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter – using longitudinal weight
932 vs. 910
Employed
922 45 22 13 45
Uneemployed 96
Inactive
741 26 21
82 vs. 97
752 vs. 753

14. Relative standard errors for estimates of changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter 2013 – using longitudilan weight
2013Q3 / 2013Q4
Unemployed
Employed
Inactive
Population under 15 CV % 6 12 10 15 1 9 13 8 23 2

15. Changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter – unweighted estimates
2013Q3 / 2013Q4
Unemloyed
Employed
Inactive
Population under 15 %
Unemployed 51 21 28 1 93 5 3 7 91 2 98

16. Y - Y

17. Basic descriptive statistics for the Y – Y longitudinal weight, compared to standard quarterly weight, 4rd quarter 2012 n
mean
stddev
min q1 q3
max
population
W_LONG12q4
4.492
457,76
323,66
41,07
251,14
561,56
3.798,98
W_CROS12q4
14.407
142,73
98,09
15,65
81,96
170,59
1.225,36

18. Changes in main employment statuses for the cohort, interviewed in 4th quarter 2012 and – using longitudinal weight
2012Q4 / 2013Q4
Unemloyed
Employed
Inactive
Population under 15
in 1000 %
Unemployed 38 39 35 36 24 25 3
841 91 56 6 27 4 68 9
645 87 2 1 19 7
274 93

19. Relative standard errors for estimates of changes in main employment statuses for the cohort, interviewed in 4th quarter 2012 and 2013 – using longitudilan weight
2012Q4 / 2013Q4
Unemployed
Employed
Inactive
Population under 15 CV % 9 13 11 15 2 14
 88 16

20. Changes in main employment statuses for the cohort, interviewed in 4th quarter 2012 and – unweighted estimates
2012Q4 / 2013Q4
Unemloyed
Employed
Inactive
Population under 15 %
Unemployed 42 33 25 3 91 6 9 88 7 93

21. Conclusions & Open questions
There are many possibilities to calculate longitudinal weights.
At each separate stage of weighting process some assumptions have to be taken.
Should we give priority to consistency of employment statuses, nonresponse adjustment, demographic distribution, at which point of time?