We have updated our Stata package surveybias, which estimates bias in pre-election polls and other surveys where the true distribution is known. A new feature facilitates the en masse comparison of surveys collected before an election. Also in this release: somewhat better documentation and toy data to get you started.
Like social networks, multilevel data structures are everywhere once you start thinking about it. People live in neighbourhoods, neighbourhoods are nested in municipalities, which make up provinces – well, you get the picture. Even if we have no substantive interest in their effects, it often makes sense to control for structures in our data to…
Should one weight their survey data? Is it worth the effort? The short answer must be ‘maybe’ or ‘it depends’. A slightly longer and much more useful answer was given by Leslie Kish in his enormously helpful paper ‘Weighting: Why, when and how’. Today (well, actually I submitted the final manuscript 2.5 years ago -…
Slightly anxious researchers that suffer from correlated disturbances shuffle into that shop and ask for the massive 18 centimetre sandwich estimator.