The SDev Samp and Sdev Est are selectable parameters available within Ponemah’s Data Reduction. The manual defines these as follows:
|The Standard Deviation of the data between the last Monitoring Time and the current.
|The Standard Deviation estimate of the entire population of data between the last Monitoring Time and the current
The mathematical difference is that Sdev Samp is divided by N, whereas Sdev Est is divided by N-1.
Data Reduction standard deviation Excel equivalents:
- SDev Samp matches STDEVP in Excel
- SDev Est matches STDEV in Excel
Note: The derived parameter Standard Deviation matches STDEVP in Excel.