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What does "not determined" mean?

The raw data provided by 23andMe is an advanced view of all the uninterpreted raw genotype data, including data that is not used in 23andMe reports. This data has undergone a general quality review however only a subset of markers have been individually validated for accuracy. As such, the data from 23andMe's Browse Raw Data feature is suitable only for research, educational, and informational use and not for medical or other use.

In order to ensure that the data we return to customers is highly accurate, we use a stringent algorithm to make genotype calls. Occasionally, a user's data may not allow us to confidently determine his or her genotype at a particular marker. When the algorithm cannot make a confident genotype call, it gives a "not determined" result instead. It is possible that future review will allow us to call the genotype, but until that time, the data does not appear. In downloaded data, the entry for any uncalled SNPs displays '--' instead of a two-letter genotype.

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