Journal
JOURNAL OF ECONOMETRICS
Volume 191, Issue 1, Pages 19-32Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jeconom.2015.08.005
Keywords
Engel curve; Errors-in-variables model; Fourier transform; Generalized function; Sieve estimation
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Measurement errors are often correlated, as in surveys where respondent's biases or tendencies to err affect multiple reported variables. We extend Schennach (2007) to identify moments of the conditional distribution of a true Y given a true X when both are measured with error, the measurement errors in Y and X are correlated, and the true unknown model of Y given X has nonseparable model errors. After showing nonparametric identification, we provide a sieve generalized method of moments based estimator of the model, and apply it to nonparametric Engel curve estimation. In our application measurement errors on the expenditures of a good Y are by construction correlated with measurement errors in total expenditures X. This problem, which is present in many consumption data sets, has been ignored in most demand applications. We find that accounting for this problem casts doubt on Hildenbrand's (1994) increasing dispersion assumption. (C) 2015 Elsevier B.V. All rights reserved.
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