Carlos, How embarrassing. I've even published a few papers on signal detection sensitivity measures, so I'm supposed to know this stuff. Thanks!
Shane > 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 > ------------------------------------------------------------------------------ > AlienVault Unified Security Management (USM) platform delivers complete > security visibility with the essential security capabilities. Easily and > efficiently configure, manage, and operate all of your security controls > from a single console and one unified framework. Download a free trial. > http://p.sf.net/sfu/alienvault_d2d_______________________________________________ > Pebl-list mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/pebl-list > ------------------------------------------------------------------------------ AlienVault Unified Security Management (USM) platform delivers complete security visibility with the essential security capabilities. Easily and efficiently configure, manage, and operate all of your security controls from a single console and one unified framework. Download a free trial. http://p.sf.net/sfu/alienvault_d2d _______________________________________________ Pebl-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/pebl-list
