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accuracy accurate adjusted analysis of variance areas Arran Banner average bias calculated census cent classified column component contingency table correlation counts covariance crop degrees of freedom determined different strata districts effects equal equation estimate of error example eye estimates fields first-stage units formula frame GENSTAT give given Hertfordshire households included individual interactions investigators mean square number of farms number of units observations obtained occasions overall parishes points probability proportional procedure quantitative random sample ratio method regions regression coefficient relative efficiency relative precision RGSP sampling error sampling units second-stage units Section selected shown in Table size-groups SPSS standard deviation standard error statistical strata stratified sample stratum sub-class sub-sample subroutine sum of squares supplementary information systematic sample taken total number types of sampling unbiased estimate uniform sampling fraction unweighted values variable sampling fraction variates weighted mean wheat acreage within-strata