Easy demand-system estimation with quaids
Abstract. Previously, to fit an almost-ideal demand system in Stata, one would have to
use the nlsur command and write a function evaluator program as
described in [R] nlsur and Poi (2008, Stata Journal 8:
554–556). In this article, I introduce the command quaids, which
obviates the need for any programming by the user. The command fits Deaton and
Muellbauer’s (1980b, American Economic Review 70: 312–326)
original almost-ideal demand-system model as well as Banks, Blundell, and
Lewbel’s (1997, Review of Economics and Statistics 79: 527–539)
quadratic variant. Demographic variables can also be included in the model.
Postestimation tools calculate expenditure and price elasticities.
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Brian P. Poi
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quaids, almost-ideal demand system
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