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GRUPPO DI RICERCA GRASPA (Gruppo di Ricerca per le
Applicazioni della Statistica ai Problemi Ambientali)
SEMINARI ORGANIZZATI DALL'UNITA' LOCALE DI ROMA (www.uniroma3.it/politiche/lagona/ambiente)
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SEMINARIO
PROF. D.A. GRIFFITH - SYRACUSE UNIVERSITY
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Relatore: DANIEL A. GRIFFITH - Syracuse University,
USA
Titolo: SMALL
GEOGRAPHIC AREA ESTIMATION CONTRIBUTIONS TO FEDERAL AGRICULTURAL
DATA
Orario: ORE 10:00 - 17 LUGLIO
2001
Luogo:
DIPARTIMENTO DI ISTITUZIONI POLITICHE E SCIENZE
SOCIALI
UNIVERSITA' DI ROMA TRE
VIA CORRADO SEGRE 4 ROMA - AULA 3.5 - TERZO
PIANO
Informazioni: Francesco Lagona , 06-5517-6400, lagona@uniroma3.it
ABSTRACT A flexible methodology will be described for
calculating spatial
autoregressive model-based small geographic area estimates, with its utility illustrated through substitution computations for the U.S. federal data hardcopy suppression code (D) in order to allow more complete data tabulations to be released. Development and evaluation of the imputation equation will be presented using principal agricultural commodities for Michigan and Tennessee. Next, post-stratification figures from the 1997 Census of Agriculture, for both major and minor commodities for Pennsylvania, will be treated. Applications of the estimation methodology are in terms of county densities. Measures of uncertainty will be presented using oats production data, based upon Monte Carlo simulations, the jackknife technique, and asymptotic standard errors. The need for constrained maximum likelihood estimates is implied by the analysis of minor crops, regardless of whether the cultivation of such crops is thinly spread across most counties, or concentrated in relatively few counties. One important finding is that reasonably accurate model-based small geographic area estimates can be obtained even for minor crops. |