Bivariate Statistics
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Navigation: Main Page -> Models -> Process Control Models
This model was released as part of build 126.
This model is used in Dynamic Simulation only.
The Bivariate Statistics model can be used to calculate and display statistical information about two variables and their correlation. The bivariate statistics graphic can be displayed by holding down the shift key and left mouse clicking on the Bivariate Statistics graphical symbol. From the menu, select "Graph" and place on the flowsheet.
| Tag / Symbol | Input / Calc | Description |
| Mode; | ||
| Tag | Output | Displays the tag name of the unit. |
| Condition | Output | OK if no errors, otherwise displays error message. |
| EqpDesc | Input | Optional unit description field. |
| Logging | Tick box | When ticked, the model will log data and perform calculations. |
| StatTag1 | Input | The first tag which will be logged, graphed (on the x-axis) and calculations performed on its values. |
| StatTag2 | Input | The second tag which will be logged, graphed (on the y-axis) and calculations performed on its values. |
| Reset | Button | This will reset the calculations and graph. |
| Auto_Reset | Tick box | If ticked, the calculations and graph will be reset at the beginning of every time the model is rerun. |
| GraphMinx | Input | The minimum value to be shown on the graph on the x-axis. Any values lower than will not be shown on the graph. |
| GraphMaxx | Input | The maximum value to be shown on the graph on the x-axis. Any values higher than will not be shown on the graph. |
| GraphMiny | Input | The minimum value to be shown on the graph on the y-axis. Any values lower than will not be shown on the graph. |
| GraphMaxy | Input | The maximum value to be shown on the graph on the y-axis. Any values higher than will not be shown on the graph. |
| Corr | Calc | The calculated correlation between the two tags StatTag1 and StatTag2. A value of 1 means they are perfectly correlated. |
| Variable 1 | ||
| Val1 | Calc | The current value of StatTag1. |
| Avg1 | Calc | The average of the logged values of StatTag1 since the model was last reset. |
| StdDev1 | Calc | The standard deviation of the logged values of StatTag1 since the model was last reset. |
| Min1 | Output | The minimum value of StatTag1 since the model was last reset. |
| Max1 | Output | The maximum value of StatTag1 since the model was last reset. |
| Variable 2 | ||
| Val2 | Calc | The current value of StatTag2. |
| Avg2 | Calc | The average of the logged values of StatTag2 since the model was last reset. |
| StdDev2 | Calc | The standard deviation of the logged values of StatTag2 since the model was last reset. |
| Min2 | Output | The minimum value of StatTag2 since the model was last reset. |
| Max2 | Output | The maximum value of StatTag2 since the model was last reset. |
| N | Output | The number of pairs of values logged since the model was last reset. |
The Histogram tab page provides a matrix of the number of instances of pairs of data occurring which are illustrated on the graph.
