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Definition | Standard deviation (std) of O-B values over a defined period |
Calculation | For each observed variable, the std of all valid data is computed for every station. |
Valid data | Data not flagged as missing value (O-B is not NULL) |
Minimum required valid data | Daily: 2 valid values |
Math expression | √∑𝑁𝑗 ((𝑂 − 𝐵) − ̅(̅𝑂̅̅̅−̅̅̅𝐵̅̅)̅̅)2⁄(𝑁 − 1) where Nj is number of valid data for variable j and the bar denotes the average as defined in Table 3. |
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