Second, the model was used to predict Pext and Pint in all countries and Chinese provinces
where no observed value had been found through data-mining, using the median predicted
value of the 1,000 bootstraps. For countries with observed values, the observed value was
retained if it was within the 1%- 99% percentile range of the 1,000 bootstrap predicted values.
If the observed value was outside this range, the upper (99% percentile), or lower (1% percentile)
predicted value was used. This allowed most extreme values in the observed data set to be
filtered out and these were mainly from unofficial sources such as personal communications.
This resulted in predicted or observed values of the proportions of chickens (Pext + Pint) and
pigs (Pext, Psint, Pint) in each system for all 205 countries, and an accompanying value for the
total stocks of chickens and pigs from FAOSTAT 2010.