Dear Shane,
I am using latest version of pebl and I belive that there is a problem in
computing d prime (d´) in CPT test. As of signal detection theory, the way
to compute d should be <http://en.wikipedia.org/wiki/D%27>: *d'* = *Z*(hit
rate) - *Z*(false alarm rate). And I belive that is inverted in Math.pebl:
##Compute d-prime
define SDTDPrime(hr,far)
{
if(not IsNumber(hr))
{
SignalFatalError("First argument of function [SDTDPrime(<hr>,<far>)] is
not a number")
}
if(not IsNumber(far))
{
SignalFatalError("Second argument of function [SDTDPrime(<hr>,<far>)] is
not a number")
}
* return CumNormInv(far)-CumNormInv(hr)*
}
But i belive that the correct should be:
##Compute d-prime
define SDTDPrime(hr,far)
{
if(not IsNumber(hr))
{
SignalFatalError("First argument of function [SDTDPrime(<hr>,<far>)] is
not a number")
}
if(not IsNumber(far))
{
SignalFatalError("Second argument of function [SDTDPrime(<hr>,<far>)] is
not a number")
}
* return CumNormInv(hr)- CumNormInv(far)*
}
Best regards,
Carlos Guilherme Schlottfeldt
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