Weight smoothing for nonprobability surveys
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Ramón Ferri-García [1] ; Jean-François Beaumont [2] ; Keven Bosa [2] ; Joanne Charlebois [2] ; Kenneth Chu [2]
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[1] Universidad de Granada
Universidad de Granada
Granada, España
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[2] Statistics Canada, Ottawa, Canada
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- Localización: Test: An Official Journal of the Spanish Society of Statistics and Operations Research, ISSN-e 1863-8260, ISSN 1133-0686, Vol. 31, Nº. 3, 2022, págs. 619-643
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Adjustment techniques to mitigate selection bias in nonprobability samples often involve modelling the propensity to participate in the nonprobability sample along with inverse propensity weighting. It is well known that procedures for estimating weights are effective if the covariates selected in the propensity model are related to both the variable of interest and the participation indicator. In most surveys, there are many variables of interest, making weight adjustments difficult to determine as a suitable weight for one variable may be unsuitable for other variables. The standard compromise is to include a large number of covariates in the propensity model but this may increase the variability of the estimates, especially when some covariates are weakly related to the variables of interest. Weight smoothing, developed for probability surveys, could be helpful in these situations. It aims to remove the variability caused by overfit propensity models by replacing the inverse propensity weights with predicted weights obtained using a smoothing model. In this article, we study weight smoothing in the nonprobability survey context, both theoretically and empirically, to understand its effectiveness at improving the efficiency of estimates.
