Data Analysis
A number of statistical processing options available from the Data Analysis drop-down list can create processed information that will be displayed for a point on a data display page when the Display Interval is not Show Data Reports.
| Data Analysis | Description |
|---|---|
| Use default analysis | The default analysis used to process data depends on the point type and rating assignment. Points that are assigned ratings to compute incremental rainfall use the Period Rainfall analysis. Counter class point types use the Difference in Report Values analysis. Total class point types use the Sum of Report Values analysis. All other point types use the Nearest Report to Interval analysis. |
| Nearest Report to Interval | Find the data report nearest to the end of the Display interval boundary. The report may occur before or after the interval boundary. |
| Last Report in Interval | Find the last data report in the Display interval boundary without going past the boundary. |
| Number of Reports | Count the total number of reports in the Display interval. |
| Period Rainfall | Sum the incremental rainfall in the Display interval. The point must be assigned an incremental rainfall rating. |
| Storm Rainfall | Find the last data report storm rainfall rating value in the Display interval. The storm rainfall rating sums the incremental rainfall until the incremental rainfall is 0. A time gap in the incremental rainfall of more then the storm rainfall rating computation interval will restart the storm rainfall accumulation. |
| Season Rainfall | Find the last data report season rainfall rating value in the Display interval. The season rainfall rating sums the incremental rainfall from the season rainfall starting date. The season rainfall starting date is set in the season rainfall rating effective time. |
| Rainfall Intensity | Find the maximum period rainfall for the Analysis interval over the Display interval. For example, find the maximum period rainfall for a 5 minute Analysis interval over a one month Display interval. |
| Difference in Report Values | Compute the difference between the last report in the Display interval and the last report from the prior Display interval. |
| Sum of Report Values | Compute the sum of report values within the Display interval. |
| Maximum | Find the maximum value for the Display interval. |
| Minimum | Find the minimum value for the Display interval. |
| Mean | Find the time-weighted average of the report values within the Display interval. |
| Variance | Compute the variance of the time-weighted values within the Display interval. |
| Standard Deviation | Compute the standard deviation of the time-weighted values within the Display interval. |
| Skew | Compute the skew of the time-weighted values within the Display interval. |
| Coefficient of Skew | Compute the coefficient of skew of the time-weighted values within the Display interval. |
| Cooling Hours | Compute cooling hours from a base temperature that is defined as the Adder under Data Analysis. |
| Heating Hours | Compute heating hours from a base temperature that is defined as the Adder under Data Analysis. |
| Rate of Change in Units per Second, Minute, Hour, or Day | Compute the rate of change for the last report in the Display interval relative to the prior report in the Display interval. You can request rate of change units as per day even if the Display interval is one hour. The analysis result displayed will be multiplied by 24 (e.g. a change of 1 unit per hour = 24 units per day). You may wish to do this because some SCADA applications expect data to be provided in gallons per day. |
| Runtime in Seconds, Minutes, Hours, Days | Runtime is the amount of time a digital status value is not zero. The concept can also be applied to any other data type. The runtime is computed to determine values that answer questions like "How long was the pump running on this day?" The time units (seconds, minutes, hours, days) define the output value. For example, 55 seconds, 35 minutes, 2.5 hours, or .5 days. |
| Volume in Units per Second, Minute, Hour, or Day | Integrates a volumetric flow rate over time to determine total volume. In NovaStar5, discharge is computed from stage using a rating table or equation. Discharge data are stored in a rated data table. An optional check box is available in the User Interface to display rated data. The volume computation units are the beginning data units integrated over time. So if the data is stored in cubic feet per second or the rating table output is cubic feet per second, then the volume units are cubic feet. To convert cubic feet to acre feet, a multiplier is used and is selected from a pick list in the advanced options to simplify the multiplier value entry. |
| Wind Speed | Compute the wind speed in units per hour from an incrementing anemometer wind sensor (a non-ALERT wind point type) for the last report in the Display interval. |