Honestly, I don't even know what agricw is, so that is no doubt true. I've been working on farms for 30-some-odd years, though, and my farming operation has been going for 17 years now, so I speak from that background. We plant once a year, we harvest once a year, etc. so the lessons to learn only come around once a year. Thus years of experience starts to become a decent proxy for what you are really trying to measure. Indeed, that doesn't work in every industry.