Well-Connected, Informative Sub-Sets of Data
H. Jorjani · Bulletin - International Bull Evaluation Service/Interbull bulletin · 2000
Two measures of connectedness for individual bulls and one measure of connectedness for countries are presented in this paper. For individual bulls the spread of a bull’s daughters in different countries is compared with a hypothetical, yet realistic and common situation in which all daughters have their records in only one country. Standard deviation of number of daughters or sum of the absolute differences from the mean number of daughter have been used to measures the spread. Both of these two methods could provide an “effective number of proofs”. For countries the measure is based on the proportion of cows sired by common bulls between the two countries. These measures would facilitate the choice of country combinations and / or bulls in estimation of genetic correlations between countries.