i'd love to know if there's research that's been done on how each additional field reduces conversion? thanks for passing along the related link. don't doubt c

i'd love to know if there's research that's been done on how each additional field reduces conversion? thanks for passing along the related link. don't doubt checkbox can be useful in certain situations. A/B testing could surely help, but this is one of those you want to get right off the bat because it's tough to recover the information that you don't collect upon signup (integrating a linkedin % complete is the best example i've seen of enticing users to add more)