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
VarianceSample Aggregate Characteristics 

Type 
Calculated 

Data Type 
Double 

Use Bounds 
None 

Timestamp 
StartTime 



StatusCode Calculations 

Calculation Method 
Custom Always Good 

Partial 
Set Sometimes If an interval is not a complete interval 

Calculated 
Set Always 

Interpolated 
Not Set 

Raw 
Not Set 

Multi Value 
Not Set 



StatusCode Common Special Cases 

Before Start of Data 
Bad_NoData 

After End of Data 
Bad_NoData 

No Start Bound 
No special handing required 

No End Bound 
No special handing required 

Bound Bad 
No special handing required 

Bound Uncertain 
No special handing required 