nonresponse, and misclassification. One model 
estimated the probability of an agricultural operation 
with unresolved farm status being a farm. The 
remaining four models estimated the probability of 
coverage, response, and correct classification of 
farms and of nonfarms. Each model was fit 
independently by two people. For some models, both 
statisticians obtained the same model. Although the 
covariates in the two selected models differed some 
for the other logistic models, the estimated 
probabilities were similar, but not identical. The 
reported standard errors account for the variability in 
the parameter estimates of the selected models, but 
not for the additional variation due to model 
uncertainty. They also do not account for any bias 
associated with a model. 
2012 Census of Agriculture APPENDIX A A - 19 
USDA, National Agricultural Statistics Service 
