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Unformatted text preview: N = 3078 counties and county-equivalents in the United States. We have data ( agsrs.dat ) from an SRS of 300 of the 3078 counties containing the 1982, 1987 and 1992 information on the number of farms, acreage devoted to farms and etc. Suppose we know the population totals for 1987 but only have 1992 information on the SRS of 300 counties. In 1987 the U.S. had a total of 2 , 087 , 759 farms. (a) Plot ACRES92 against FARMS87. Comment on the plot. (b) Use ratio estimation to estimate the total number of acres devoted to farming in 1992 (ACRES92), using the number of farms in 1987 (FARMS87) as the auxiliary variable. Give the standard error. (c) Repeat part (b), based on a model. Perform diagnostics and comment on the model assumptions. (d) Repeat part (b), using regression estimation. (e) Repeat part (d), based on a model. Perform diagnostics and comment on the model assumptions. 1...
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This note was uploaded on 11/24/2010 for the course STAT 201a taught by Professor Wu during the Spring '10 term at Pasadena City College.
- Spring '10