K. Rutar - An example of longitudinal LFS weights
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An example of longitudinal LFS weights
Division for general methodology and standards
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LFS panel sample sizes (number of households) for the years 2012 and 2013
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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
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Number of responding individuals
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Number of responding individuals – 15 years +
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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% 0,1% 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%
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Attrition by selected relevant characteristics of the household (completion rate)
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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)
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Longitudinal population Q – Q (July 1st 2013 vs. Oct 1st 2013)
3th quarter 2013 3th and 4th quarter 2013 4th quarter 2013
Male Female Male Female Male Female
0 - 14 years 153.993 145.295 153.678 144.998 154.432 145.840
15 - 64 years 721.773 682.194 718.959 680.540 720.853 681.283
65 years + 143.892 211.967 142.177 209.948 145.170 213.085
Total 1.019.658 1.039.456 1.014.814 1.035.486 1.020.455 1.040.208
2.059.114 2.050.300 2.060.663
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Longitudinal population Y – Y (Oct 1st 2012 vs. Oct 1st 2013)
4th quarter 2012 4h quarter 2012 and 2013 4th quarter 2013
Male Female Male Female Male Female
0 - 14 years 152.786 144.173 151.971 143.441 154.432 145.840
15 - 64 years 724.926 685.520 715.330 679.943 720.853 681.283
65 years + 140.765 209.953 133.570 200.967 145.170 213.085
Total 1.018.477 1.039.646 1.000.871 1.024.351 1.020.455 1.040.208
2.058.123 2.025.222 2.060.663
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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 2.059.114
W_CROS13q3 15.486 132,97 90,25 10,79 76,44 159,86 1.100,41 2.059.114
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Changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter 2013
– using longitudinal weight
2013Q3 / 2013Q4 Unemloyed Employed Inactive Population under 15
in 1000 % in 1000 % in 1000 % in 1000 %
Unemployed 48 50 22 23 26 27
Employed 13 1 865 94 45 5
Inactive 21 3 45 6 677 91
Population under 15 4 1 294 99
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Changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter 2013
– using longitudinal weight
Employed922
Inactive741
Uneemployed96
45
22
4513
26
21
82 vs. 97 752 vs. 753
932 vs. 910
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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 % % % %
Unemployed 6 12 10
Employed 15 1 9
Inactive 13 8 1
Population under 15 23 2
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Changes in main employment statuses for the cohort, interviewed in 3rd and 4th quarter 2013
– unweighted estimates
2013Q3 / 2013Q4 Unemloyed Employed Inactive Population under 15
% % % %
Unemployed 51 21 28
Employed 1 93 5
Inactive 3 7 91
Population under 15 2 98
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Y - Y
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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 2.056.262
W_CROS12q4 14.407 142,73 98,09 15,65 81,96 170,59 1.225,36 2.056.262
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Changes in main employment statuses for the cohort, interviewed in 4th quarter 2012 and 2013
– using longitudinal weight
2012Q4 / 2013Q4 Unemloyed Employed Inactive Population under 15
in 1000 % in 1000 % in 1000 % in 1000 %
Unemployed 38 39 35 36 24 25
Employed 25 3 841 91 56 6
Inactive 27 4 68 9 645 87
Population under 15 2 1 19 7 274 93
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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 % % % %
Unemployed 9 13 11
Employed 15 2 11
Inactive 14 9 2
Population under 15 88 16 2
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Changes in main employment statuses for the cohort, interviewed in 4th quarter 2012 and 2013
– unweighted estimates
2012Q4 / 2013Q4 Unemloyed Employed Inactive Population under 15
% % % %
Unemployed 42 33 25
Employed 3 91 6
Inactive 3 9 88
Population under 15 7 93
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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?