Survey Weights Regression
Using weights in the analysis of survey data david r.
Survey weights regression. In numerous discussions with colleagues i am struck by the varied views and confusion around whether to use sample weights in regression analysis a confusion that i share at times. Survey weight for atp wave 23. The general guidance is that if analysts can control for the factors that were used.
Knitr 1 2 the following example relies on the svyglm function from the r survey package. Survey weighting and regression samantha r. Cook andrew gelman columbia university department of statistics new york ny 10027 abstract 1 introduction in the words of andrew gelman survey weighting is a mess f ull weighting that is creating weights based on cell.
These data collections use complex and multi stage survey sampling to ensure that results are representative of the u s. Multiple regression models with survey data. Although use of survey weights is sometimes contested in regression analyses they are needed for simple means and proportions.
Johnson deppgyartment of sociology population research institute the pennsylvania state university november 2008 what is a survey weight. Although the question of whether to use weights applies more generally to the analysis of data from complex surveys our focus here is on methods for testing whether survey weights are needed in a regression analysis which is perhaps the most widely used statistical model in the social and behavioral sciences. Code for this page was tested in r version 3 0 1 2013 05 16 on.
More detailed instructions and additional usage examples can be found on the survey package s survey weighted generalized linear models page. This example is taken from lehtonen and. Weighting survey methods employ sampling weights in the computation of descriptive statistics and the ﬁtting of regression models in order to describe the population and make inferences about the population.
A weight variable provides a value the weight for each observation in a data set. Regression becomes a more useful tool when researchers want to look at multiple factors simultaneously. Sampling weights i correctly scaled sampling weights are necessary for estimating population totals.
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