The Economics of Randomized Field Experiments

The rates were 90 % when you started, at least in your communities. What are they now in the parts of western kenya that we work in? The latest data i've seen is from a couple of years ago, but they're down to something like 20% from 90%. You noted that economists didn't really do randomized field experiments in the mid 19 nineties. It seems so obvious if economists want to learn about worms, they should be outdoing the coni studies. But strange that you and i are about the same age. When we were in grad school, it wasn't a i remember the first time some one told me about a randomise experiment. My reaction was