If corresponding confidence intervals were constructed 

 for all possible samples of the same size and design, 

 approximately 2 out of 3 (67 percent) of these intervals 

 would contain the figure obtained from a complete 

 enumeration. Similarly, a 95-percent confidence interval 

 is $261,243 to $292,239 (i.e., $276,741 plus or minus 

 2 x $7,749). 



Table A presents Puerto Rico's estimates of major items 

 for all farms and for farms with sales of $2,500 or more 

 and measures of their reliability. The estimate and the 

 relative standard error of the estimate is given for selected 

 sample items. The relative standard error of the estimate 

 measures the variation associated with the use of a 

 sample of farms to estimate totals. It does not measure 

 census variability associated with partial or item 

 nonresponse among farms, response error or content 



error. The relative standard error of estimate for sample 

 items measures sampling error. It measures the variation 

 associated with selecting a sample to estimate sample 

 items. The reliability of municipio estimates may vary 

 substantially from each other and will usually be larger 

 than the Puerto Rico estimate. 



Table B presents the estimate of reliability at the 

 municipio level for 1 7 sample items. The relative standard 

 error of the estimate for the same item differs among the 

 municipios in Puerto Rico. Reasons for this are (1) dif- 

 ferences among municipios in the total number of farms, 

 (2) the number of large farms included with certainty, (3) 

 the size classifications of farms sampled, (4) the general 

 agricultural characteristics, and (5) the specific 

 characteristic being measured. 



Table A. Estimates of Reliability for Selected Items: 1982 



[For enumeration periods, see appendix A; and for meaning of abbreviations and symbols, see introductory text] 



Total 

 (number) 



Relative standard error of 

 estimate (percent) 



Farms with sales of $2,500 or more 



Livestock and poultry purchased farms.. 



dollars.. 

 Feed purchased for livestock and poultry __ farms.. 



dollars.. 

 Medicines and drugs purchased for livestock 

 and poultry farms.. 



dollars.. 

 Seeds, bulbs, plants, and trees purchased farms.. 



dollars.. 



Commercial fertilizer purchased farms.. 



dollars.. 

 Gasoline and other fuel and oil products 

 purchased farms.. 



dollars.. 

 Wages and salaries of hired farm workers 

 and family members farms.. 



dollars.. 

 Contract labor farms.. 



dollars.. 

 Machine hire and customwork farms.. 



dollars.. 

 Agricultural chemicals purchased farms.. 



dollars.. 



Hired farm workers agregados and 

 sharecroppers: 



Worked 5 months or more farms.. 



number.. 



Worked less than 5 months farms.. 



number.. 

 Agregado and sharecropper families living 



on place July 1, 1983 farms.. 



number.. 



Chemical products used tor sprays, dusts, 

 fumigants, etc., to control — 

 Insects on crops and cultivated and/or 



improved pastures farms.. 



cuerdas on which used. . 



Diseases in crops and orchards farms.. 



cuerdas on which used.. 



Weeds or grass in crops and pastures farms.. 



cuerdas on which used.. 



Ume farms. . 



cuerdas on which used., 

 tons.. 



7 463 



25 984 943 



9 978 



111 898 296 



4 752 

 4 605 540 



4 875 

 4 424 869 



14 126 



16 635 863 



13 926 

 12 012 739 



9 319 



80 498 656 



936 



4 357 851 



3 060 



5 409 465 



6 263 



6 149 722 



3 133 

 15 621 



7 836 

 34 676 



1 557 

 3 768 



3 402 

 81 263 



1 276 

 20 089 



2 678 

 67 763 



1 429 

 14 596 

 18 369 



1.2 

 .3 



1.1 

 .3 



1.4 

 .5 



1.7 

 .8 



.6 



.5 



.6 



.4 



1.0 

 .5 



3.2 

 .7 

 2.1 

 1.4 

 1.5 

 .5 



1.6 



.7 

 1.2 



1 2 



2.6 



18 



22 

 .7 



36 



1 6 



2 5 

 1.0 



34 

 23 

 44 



1982 CENSUS OF AGRICULTURE 



APPENDIX A A-7 



