Bivariate Statistics
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Contents
General Description
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.
Data Sections
The default sections and variable names are described in detail in the following tables. The default Bivariate Statistics access window consists of 2 sections. This number may increase or decrease, based on user configuration.
Summary of Data Sections
 BivariateStats tab  Contains general information relating to the unit.
 Info tab  Contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents.
Bivariate Statistics Page
Unit Type: BivariateStats  The first tab page in the access window will have this name.
Tag (Long/Short)  Input / Calc  Description/Calculated Variables / Options 
Tag  Display  This name tag may be modified with the change tag option. 
Condition  Display  OK if no errors/warnings, otherwise lists errors/warnings. 
ConditionCount  Display  The current number of errors/warnings. If condition is OK, returns 0. 
GeneralDescription / GenDesc  Display  This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here. If this field is blank, then:

Requirements  
On  Tick box  When ticked, the model will log data and perform calculations. 
StatTag1  Input  The first tag which will be logged, Variable 1. This will be graphed on the xaxis and calculations performed on its values. 
StatTag2  Input  The second tag which will be logged, Variable 2. This will graphed on the yaxis 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 model run. 
Graph_x_Minimum / GraphMinx  Input  The minimum value to be shown on the xaxis of the graph. Any values lower than this will not be shown on the graph. 
Graph_x_Maximum / GraphMaxx  Input  The maximum value to be shown on the xaxis of the graph. Any values higher than this will not be shown on the graph. 
Graph_x_Minimum / GraphMiny  Input  The minimum value to be shown on the yaxis of the graph. Any values lower than this will not be shown on the graph. 
Graph_y_Maximum / GraphMaxy  Input  The maximum value to be shown on the yaxis of the graph. Any values higher than this will not be shown on the graph. 
Correlation / Corr  Calc  The calculated correlation between the two tags StatTag1 and StatTag2. A value of 1 means they are perfectly correlated. 
Variable 1  
Value1 / Val1  Calc  The current value of Variable 1 (StatTag1). 
Average1 / Avg1  Calc  The average of the logged values of Variable 1 since the model was last reset. 
StandardDeviation1 / StdDev1  Calc  The standard deviation of the logged values of Variable 1 since the model was last reset. 
Minimum1 / Min1  Output  The minimum value of Variable 1 since the model was last reset. 
Maximum1 / Max1  Output  The maximum value of Variable 1 since the model was last reset. 
Variable 2  
Value2 / Val2  Calc  The current value of Variable 2 (StatTag2). 
Average2 / Avg2  Calc  The average of the logged values of Variable 2 since the model was last reset. 
StandardDeviation2 / StdDev2  Calc  The standard deviation of the logged values of Variable 2 since the model was last reset. 
Minimum2 / Min2  Output  The minimum value of Variable 2 since the model was last reset. 
Maximum2 / Max2  Output  The maximum value of Variable 2 since the model was last reset. 
Number_of_Records / N  Output  The number of pairs of values logged since the model was last reset. 
Adding this Model to a Project
Insert into Configuration file
Sort either by DLL or Group.

DLL: 
ControlDyn.dll 
→ 
Units/Links 
→ 
Statistics: Bivariate Statistics 
or 
Group: 
General 
→ 
Units/Links 
→ 
Statistics: Bivariate Statistics 
See Project Configuration for more information on adding models to the configuration file.
Insert into Project

Insert Unit 
→ 
Statistics 
→ 
Bivariate Statistics 
See Insert Unit for general information on inserting units.