On Feb 13, 8:41*am, Bob Whelan wrote:
On 2/13/2011 8:41 AM, db_sonic wrote:

Anecdotal evidence can be the best kind sometimes...it's from the real world!

I'd distinguish anecdotal from empirical evidence. The latter implies
some sort of controlled experiment where the causes, effects and
exogenous variables can be measured and related, the former doesn't
and therefore is often suspect - sometimes to a very great degree.

The Wil Schuemann story falls into the anecdotal category - and it's
suspect because no one measured how much time he spent in the sun
while not under the ASW-12's canopy.

I'd be more inclined to trust experimental UV transmissivity tests on
real canopies.

9B