calculate signal detection theory (SDT) metrics such as d' and c
calculate_sdt(n_tp, n_tn, n_fp, n_fn)number of true positives (or hit)
number of true negatives (or correct rejection)
number of false positives (or false alarm)
number of false negatives (or miss)
data.frame of signal detection theory metrics along with all the variables created along the way
#example to be written