what is the purpose of using regression to obtain an estimate of the ld50 why do we use regression to determine ld50 what is the purpose of using regression to obtain ld50 what is the purpose of using regression why is regression useful in ed50 ld50 definition and example why does regression help to obtain ld50 what is the purpose of using regression to obtain ld50 how to determine ld50 what is the purpose of using regression to obtain ld50? what is the purpose of using regression to obtain ld50? what is the purpose of using a regression to obtain ld50. what is the purpose of using regression to obtain ld50 what is the purpose of using regression to obtain ld50? what is the purpose of using regression to obtain ld50 what was ld50 in a regression what is the purpose of using regression to obtain ld50? what does the purpose of regression for ld50 mean how to predict ld50 how can i calculate ld50