can anyone point me to documentation for the quest procedure? i can't seem to
find any anywhere, and the demo program that comes with it isn't particularly
informative. in particular, my initial attempts at using the procedure always
result in quest estimating the threshold downward, and i need it to estimate
upward.
also, something i read somewhere said that the initial guess and s.d. of the
guess need to be fairly accurate, as the procedure will have difficulty
generating an accurate estimate if the true threshold is more than one
s.d. away from the initial guess. despite this, the procedure doesn't seem to
ever guess very far away from my initial guess. for example, true threshold
is 40, i input an initial guess of 30 and s.d. of 10 (and even 20), and quest
never guesses beyond 32.5 (i actually have to guess -30; otherwise quest
guesses downward, as i already mentioned: i need to figure out how to get it
guess upward). so, how can the procedure to guess "more boldly" (so to
speak)? i've tried increasing beta (the "steepness" parameter) from 3.5 to
7.0, but this didn't help.
so, as i said, i'm looking for some good documentation, and/or some good,
complete, real examples. thanks in advance for any and all assistance!
cheers,
doug