Compute s for the pairs (H,F) = (0.80, 0.20), (H,F) = (0.8, 0.6) and (H,F) = (0.80, 0.90). In a psychophysical experiment designed to measure performance in a recognitiontask, a subject is presented...
Compute s for the pairs (H,F) = (0.80, 0.20), (H,F) = (0.8, 0.6) and (H,F) = (0.80, 0.90).
In a psychophysical experiment designed to measure performance in a recognition
task, a subject is presented with a set of pictures of people’s faces. Later, the
subject is presented with a second set of pictures which contains the previously
shown pictures and some new ones. The subject then is asked to answer “yes” or
“no” to the question “Do you recognize this face?” We would like to determine
a measure of the observer’s ability to discriminate between the previously shown
pictures and the new ones.
If a subject correctly recognizes a face as being one of the previously shown
ones, it is called a “hit.” If a subject incorrectly states that they recognize a face,
when the face is actually a new one, it is called a “false alarm.” The proportion
of responses to previously shown faces which are hits is denoted by H, while the
proportion of responses to new faces which are false alarms is denoted by F.
A measure of the ability of the subject to discriminate between previously shown
faces and new ones is given by
all are in log base 10
s = (1/2)(((Log(H/1-H))-log(F/1-F))
3. Compute s for the pair (H,F) obtained in
this previous problem- s = (1/2)(((Log(H/1-H))-log(F/1-F)) Compute H and F
as well as for the
pairs (H,F) = (0.80, 0.20), (H,F) = (0.8, 0.6) and (H,F) = (0.80, 0.90).
- print Print
- list Cite
Expert Answers
calendarEducator since 2011
write5,349 answers
starTop subjects are Math, Science, and Business
You need to substitute 0.80 for H and 0.20 for F in equation of s to evaluate s, such that:
`s(0.80, 0.20) = (1/2)(log(H/(1-H))-log(F/(1-F))`
`s(0.80, 0.20) = (1/2)(log(0.80/(1-0.80))-log(0.20/(1-0.20))`
`s(0.80, 0.20) = (1/2)(log(0.80/0.20)-log(0.20/0.80))`
Using logarithmic identities, you may convert the logarithms of quotients in a difference of...
(The entire section contains 122 words.)
Unlock This Answer Now
Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.
Related Questions
- s = (1/2)(((Log(H/1-H))-log(F/1-F)) Compute s for the pair (H, F) for thepairs (H, F) = (0.80,...
- 1 Educator Answer
- Prove that log(a) b = 1/(log(b) a)
- 1 Educator Answer
- If f(x) = 3x^2 - x + 2, find f(2), f(-2), f(a), f(-a), f(a+1), 2*f(a), f(2a), f(a^2), (f(a))^2...
- 1 Educator Answer
- If f(x)=x+4 and h(x)=4x-1, find a function g such that g(f(x)) = h(x).
- 2 Educator Answers
- s = (1/2)(((Log(H/1-H))-log(F/1-F)) Compute H and FIn a psychophysical experiment designed to...
- 1 Educator Answer