The VarianceSample Aggregate defined in Table 49 retrieves the square of the standard deviation. Its behaviour is the same as the StandardDeviationSample Aggregate. Unless otherwise indicated, qualities are Good, Calculated.
This calculation is for a sample population 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 49 – VarianceSample Aggregate summary
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VarianceSample Aggregate Characteristics |
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|
Type |
Calculated |
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|
Data Type |
Double |
|
|
Use Bounds |
None |
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|
Timestamp |
StartTime |
|
|
|
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StatusCode Calculations |
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|
Calculation Method |
Custom Always Good |
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|
Partial |
Set Sometimes If an interval is not a complete interval |
|
|
Calculated |
Set Always |
|
|
Interpolated |
Not Set |
|
|
Raw |
Not Set |
|
|
Multi Value |
Not Set |
|
|
|
||
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StatusCode Common Special Cases |
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|
Before Start of Data |
Bad_NoData |
|
|
After End of Data |
Bad_NoData |
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No Start Bound |
No special handing required |
|
|
No End Bound |
No special handing required |
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|
Bound Bad |
No special handing required |
|
|
Bound Uncertain |
No special handing required |
|