On Fri, 13 Jan 2006 11:22:38 -0800, wrote:

Don,

I have carefully read your protocol for DBT of cables, and it seems to me
airtight. You've covered all the places where most tests fail, and I would
add only a couple of things:

Don't let the subject know how he's doing until the test is over. Also,
make sure you remove the cables before you flip the coin, so that the time
required to make the change will be constant even when no change is called
for.

You might consider 18 trials, since 13 out of 18 comes closer to the 5%
dividing line between success and failure.

Norm Strong


Thanks. Not only does the subject not know how he's doing until the
end - nobody does. Only when the two forms are put side-by-side does
that emerge.

As for the time to change cables, I have covered that. Once a trial is
done, the existing cable is removed to the other room before the coin
is tossed. This means that the procedure is the same whether the cable
changes or not.

As for the number of trials, I used the number proposed by Stewart for
his £1,000 challenge. Any trial that does not form part of that can,
of course, have different pass criteria.

d

Pearce Consulting
http://www.pearce.uk.com