I am conducting a test with signal detection theory (‘old’/’knew’ & ‘same’/different’), and have the Syntax and results for Hit rates, correct rejections, adjusted HR, adjusted False alarms (too ensure d’ does not sum to infinity) and also Bias (c). However, some of my data is skewed (negatively) and have found that d’ is not appropriate for this, and should use A’ instead.
When I have looked at articles with A’, I managed to find this:
COMPUTE APRIME = .5 + (ABS(HR – FA)/(HR – FA))*((HR – FA)**2 + ABS(HR – FA)) / (4*MAX(HR,FA) – 4*HR*FA).
(Stanislaw & Todorov, 1999)
However, when I input this into SPSS with my own variable names some of the functions do not come up in red (i.e., the second ABS – the first one does appear red). Note: I am fairly new to SPSS Syntax, but I understand that bright red means an error somewhere.
My question is therefore:
Will it matter in computing my data if the functions (i.e., ABS, MAX etc.) are not coloured red? Will the SYNTAX ignore them or include them?
Thank you all in advance, feel free to ask if I have not explained anything properly or have any questions.