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OPC-10000-13 – OPC Unified Architecture - Part 13: Aggregates5.4.3.38 VarianceSamplepopulation where the calculation is done on a subset of the full population. Use VariancePopulation to calculate the variance of a full set of data ( 5.4.3.40 ). Table 86 - VarianceSample Aggregate
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OPC-10000-13 – OPC Unified Architecture - Part 13: Aggregates5.4.3.40 VariancePopulationVariancePopulation The VariancePopulation Aggregate defined in Table 88 retrieves the square of the standard deviation. Its behaviour is the same as the StandardDeviationPopulation Aggregate . Unless otherwise indicated, qualities are Good ... calculate the variance of a subset of the full population ( 5.4.3.38 ). Table 88 - VariancePopulation Aggregate summary VariancePopulation Aggregate Characteristics Type Calculated Data Type Double Use Bounds None Timestamp StartTime StatusCode