User blog comment:BonesMcGee/Brainstorm: Potential savings in using the hurry hatch trick/@comment-5116140-20120905140359/@comment-5116140-20120905160540

Excellent - and the most exciting thing is that not all your data supports the simple Spinning Drum model! There is something else goin on as well!

We should be able to figure out what it is using this great data.

The failure issue is critical as it is human nature not to report previous days when they got nothing. But skipping any of the misses will systematically bias the data.