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Definition | Number of observations per station as received by each NWP Centre during a defined period. |
Calculation | For each observed variable, the sum of all valid data is computed |
Valid data | Data not flagged as missing value |
Math expression | Nj, where where N is the total number of valid data for variable j. |
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Definition | Number of observations per station as received by each NWP centre during a period divided by the number of expected for that period |
Calculation | Total of received observations per observed variable calculated as described in Table 1 divided by the sum of all expected observations for the period. |
Expected data | ‘International exchange schedule’ and ‘observation schedule’ obtained from OSCAR/Surface database |
Math expression | NValid ⁄NExpected ∗ 100%, where NValid is the maximum of Nj as described in Table 1 . |
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