Originally Posted by
kbarch
As far as wind goes, I'll concede the point made by the diagrams @
HTupolev provided. However, we're talking Central Park here, which is largely protected, and what counts as "windy" here really isn't much to begin with. It's not like the "experiment" was conducted on some windswept prairie.
Depends on how much precision and accuracy you want. If you don't care/need much, it's not hard to get ballpark estimates. If you do, you need to be pretty anal about either controlling or measuring the things that affect the thing you're trying to estimate.
HR isn't one of those.