1. Evaluation of non-sampling errors in the US National Swine Survey;Bush;Prev. Vet. Med.,1995
2. NAHMS NSS Comparison study;Cowen,1993
3. Plans in regard to animal morbidity and mortality reporting;Clarkson,1954
4. NADS: implications for the livestock industry;Dahl;J. Vet. Med. Educ.,1985
5. Statistical Methods for Rates and Proportions;Fleiss,1981