Signal detection theory

[Tobias]

Hi together,

this might be a bit off topic but as you are all very much into
psychological experimental science you might be of great help for this
issue. Besides, my topic is the outcome of an E-Prime experiment ;)

It is about the response bias in signal detection theory (SDT). I've
heard that C is usually better than Beta as a measure of response bias
as it is indpendent of d'. Now what I have in my experiment is a very
high hit rate for condition A and a lower hit rate for condition B.
False alarm rates are however the same for A and B. So what I get
using the formula for C (C = -0.5*(z(false alarms) + z(hits)) is a
liberal criterion C for A and a less liberal criterion for B.

So can I actually say that A is more liberal? Apparently this is only
due to the fact that the hit rate is higher. I am quite puzzled by
this... glad for any help!

Tobias

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