Abstract #301578

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JSM 2003 Abstract #301578
Activity Number: 170
Type: Contributed
Date/Time: Monday, August 4, 2003 : 2:00 PM to 3:50 PM
Sponsor: Section on Survey Research Methods
Abstract - #301578
Title: Sample Allocation for Estimation of NML Farms for the 2002 Census of Agriculture
Author(s): Floyd M. Spears*+ and Raj S. Chhikara and Charles R. Perry
Companies: Harding University and University of Houston, Clear Lake and USDA/National Agricultural Statistics Service
Address: Dept. of Mathematics, Searcy, AR, 72149-0001,
Keywords: Census of Agriculture ; area frame sampling ; mixed model ; sample allocation ; variance function
Abstract:

A mixed model approach was utilized to develop stratum variance estimates for use in determining the sample allocation for estimation of "Not on Mail List" (NML) farm counts in the 2002 U.S.Census of Agriculture. Estimation of stratum variances for the NML farm counts is modeled in terms of the total number of farms and heterogeneity due to land use stratification. Previous survey data are utilized for model fits. The total number of farms is a significant predictor of the stratum variance. Stable stratum variance estimates are obtained even when the number of sample units is small. Sample allocation was carried out by adding the NML farm item to the set of eight agriculture items currently used by USDA in the multivariate sample allocation for its annual June Area Frame Survey. Various supplemental area frame sample allocations are investigated to find one that is cost effective and leads to the desired level of reliability. Changes in the sample allocation are recommended in area frame sample design to support both the current USDA sample survey-based estimates and the 2002 Ag Census NML farm count estimate.

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