An assessment of the robustness of weights in the famille et employeurs survey
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An assessment of the robustness of weights in the Famille et Employeurs survey. Nicolas Razafindratsima ( [email protected] ) & Elisabeth Morand ( [email protected] ) INED. European Conference on Quality in Official Statistics, Rome, July 2008. Outline. Introduction

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An assessment of the robustness of weights in the Famille et Employeurs survey

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An assessment of the robustness of weights in the famille et employeurs survey

An assessment of the robustness of weights in the Famille et Employeurs survey

Nicolas Razafindratsima ([email protected])

& Elisabeth Morand ([email protected])

INED

European Conference on Quality in Official Statistics,

Rome, July 2008


Outline

Outline

  • Introduction

  • The Famille et Employeurs survey

  • Methodology of weights calculations

  • Results

  • Conclusion


Introduction

Introduction

  • In indirect sampling : the generalized weight share method (Lavallée, 2002 & 2007) is a simple and easy strategy to produce unbiased estimations

  • Objective of this study : to expose the implementation of this method for the Familles et Employeurs survey (Ined/Insee, 2004-2005) : difficulties, and robustness of the weights obtained.


The familles et employeurs survey

The Familles et Employeurs survey

  • Main purpose : to study professional and family life conciliation: - from the employees point of view - from the employers point of view

  • Can behaviours within the family be explained through employers rules and characteristics?

  • A matched survey: employee  employers


The household survey

The household survey

  • Sampling strategy :- a sample of 11 719 dwellings drawn from the INSEE master sample  6 167 of them answered

    - interview of 1 or 2 individuals, aged 20-49, in each household (random sampling if >2)  9 547 respondents

  • Face to face interview. Questionnaire on demographic events (birth, unions), family life organization, etc., in relation to individuals professional context


The establishment survey

The establishment survey

  • Target : Establishments of 20 employees or more

  • Individuals respondents were asked to give their employers name, address, national identification number as well as their size and sector.

  • A self administered questionnaire was sent to the establishments. Possibility to answer by paper or by the Internet. 2 673 respondents.


Weighting methodology

Weighting methodology

  • The basic for establishments weighting methodology : the generalized weight share method

Where :

Wi=weight of establishment i

Wj=weight of individual j (those in the sample)

Li= number of eligible employees (aged 20-49) in the establishment i


Weighting methodology1

Weighting methodology

  • Difficulties :

    - the choice of individuals weight (non-response, calibration)

    - the estimation of the number of employees aged 20-49 in the establishment

    [- establishment non-responses]


Weighting the sample of individuals

Weighting the sample of individuals

  • Non response variations :

    • At the household level (non-response higher in urban areas, for collective dwellings, etc.)

    • At the individual level (non-response higher for males, single persons, less-educated people, etc.)

  • Non-response adjustments :

    • At the household level : using corrective response rates within response homogeneity groups

    • At the individual level : calibration (on Labor force survey data)

      - on a single variable : gender*age

      - or on 7 variables : gender*age, employment status, nationality, region, highest diploma, urbanization status, household size


Distribution of individuals weights

Distribution of individuals weights


Estimation of the number of eligible employees aged 20 49

Estimation of the number of eligible employees (aged 20-49)

  • Number of employees (total and by age groups) asked in the establishment questionnaire

  • But number of 20-49 not available for 16% of the establishments (item non-response)

  • Imputation of number of 20-49 when non-response : using coefficients of a regression model among respondents, linking nb of 20-49 to total (one model by activity sector)

  • For 2/3 of the establishments, total size is also available through the SIRENE directory. Allows an other estimation of 20-49 number for evaluation purposes


Distribution of total size

Distribution of total size


Distribution of number of 20 49

Distribution of number of 20-49


Summary of the options for establishments weighting

Summary of the options for establishments weighting

Employees weight=establishment weight*nb of employees


Distribution of establishment weights

Distribution of establishment weights


Distribution of employees weight

Distribution of employees weight


Percentage of establishments having a cr che

Percentage of establishments having a crèche


Percentage of employees working in an establishment with a cr che

Percentage of employees working in an establishment with a crèche


Conclusion

Conclusion

  • Weight sharing method :

    • A simple and easy to implement method

    • However, difficult to implement in the Famille et Employeurs survey, due to :

      • non-responses on the ‘link’ variable

      • High dispersion of the size variable

  • More sensitive to the link variable than on specification of the individual weights

  • All the computed weights present great variability

  • Weight trimming may improve precision at the establishment level, but fails to do so at the employees level


References

References

  • Lavallée, P. (2002) : Le sondage indirect, ou la méthode généralise du partage des poids, Bruxelles, Presses de l’université libre de Bruxelles et Paris, Ellipses, 242 pages.

  • Lavallée, P. (2007) : Indirect sampling, New York, Springer (Springer series in statistics), 245 pages.


An assessment of the robustness of weights in the famille et employeurs survey

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