Table 1.

The four quality states specified for the quality flag scheme of the Intergovernmental Oceanographic Commission (IOC). These four discrete states are used to represent the hidden quality state (node C in Figure 3) of the Bayesian network implementation. Each quality assessment involves performing an inference upon these quality states given the observed cause and effect variables of the network. The quality state of code 3 “bad data that is potentially correctable” was referred to as probably bad data in the experiment.

Quality Code	Code Meaning
1	Good data
2	Probably good data
3	Bad data that are potentially correctable (Probably bad data)
4	Bad data