
126 Control for Aluminum Production
hot/normal pot distinction. Therefore, the cohort of hot pots as detected
here should be treated with caution.
Can the potroom manager improve his or her decision making
by reducing the probability of a false alarm? This could be done by
counting only the pots above 980
°
C, for example. This represents
a movement of the β response criterion to the right in Figure 8.1 and
would decreasethe false alarm probability back toward 5%. However,
it also would increasetheprobability of a failed alarm or “miss”—the
chance that a real increase in hot pots is occurring but goes unnoticed.
Such a temperature increase ...