Model Data Comparison ยป |
|||
---|---|---|---|
The Model Data Comparison Node is used to display values and charts for experimental and calculated variables in the Project. Tabbed Views Actions Grid Views Select Variable Select Sets to View Select Variables to View Tabbed Views Values Charts
Select Variable
Top of Topic In the Variable droplist you may select the variable whose experimental and calculated numerical values are to be displayed. Typing the first few (up to 5) letters of the desired variable name is a convenient keyboard way to select the desired variable. By default, this droplist contains variables like compounds, pseudo-compounds, derived quantities, temperature, etc. If the Single Set action is performed, the droplist shows all the included sets in the project. To go back to the default, you must do the Single Compound action. In the Data Series droplist, you may select among Total Moles or Total Mass and Phase Name options. For a PFR reactor with Recycle, you will also see the Value Type droplist, where the PFR and Overall options are available. When the PFR option is chosen, you will see information within the PFR reactor, when the Overall option is chosen, only information related to the Fresh Inlet and Overall output of the recycled PFR system is shown. You may explore the Example to learn more about these options. The Show Parity Plots checkbox is available when you are in the Charts tab. When this option is enabled, the index of correlation p and the Pearson correlation coefficient r are shown in the chart title. The index of correlation (p) is calculated according to the formula below. It uses the ratio of the total prediction error with the spread in the experimental data. When the prediction error is zero, the p value is 1 indicating a perfect fit. As the prediction error increases, the p value reduces until a minimum value of 0, indicating a poor fit. where and are the experimental and calculated (predicted) values at the datapoints Pt, while is the average of the experimental values in the chart. The Pearson correlation coefficient (r) is defined as shown below. The coefficient values ranges from -1 to +1, where 1 indicates perfect positive correlation, 0 is for no correlation and -1 with perfect negative correlation. The Ignore Zero Measurements checkbox is enabled when the charts are being shown. When this box is checked, the points that have measurements values equal to zero are not displayed in the chart.
Select Sets to View
Top of Topic This pane displays all the sets of the Project. It is available by default, but is minimized and comes into view by moving the mouse to the Select Sets to View tab located near the upper right corner. This pane is hidden after performing the Single Set action. It contains the following views:
Select Variables to View
This pane displays all the compounds/pseudo-compounds/derived quantities of the Project. It is only available after the Single Compound action has been executed. When available, it is minimized by default and comes into view by moving the mouse to the Select Variables to View tab located near the upper right corner. This pane is similar to Select Sets to View, except that compounds/pseudo-compounds/derived quantities are the variables to be selected to display, instead of Sets. Top of Topic
Values
This view is stacked in tabs along with the charts, and is visible by default. This view displays the experimental and calculated variable values at each data point, for the Selected Variable. Please note that the information displayed is for the compound or process variable selected in the Select Variable grid and for all the sets chosen in the Select Sets to View grid, if the Single Compound action is executed. If the Single Set action is executed, the information is displayed for the set chosen Select Variable grid and for all the variables chosen in Select Variables to View grid. For the derived quantities and the pseudo-compounds, the values are shown for Total Moles or Total Mass and they are obtained by the methods detailed in Note1. Top of Topic
Charts
The chart is stacked in tabs along with the Values view. As it is not shown by default, you may view it by clicking on the Charts tab. This chart displays the experimental and calculated variable values at each data point, for the selected Variable. As described above for the Values tab, the information displayed here depends on the choice of single set or single compound. For the derived quantities and the pseudo-compounds, the values are shown for Total Moles or Total Mass and they are obtained by the methods detailed in Note1. The way the information is displayed depends on the selection made on the Show Parity Plots checkbox in the Select Variable view:
Chart Options You may use the Zoom In/Out features in this chart. When a chart is zoomed in with the Parity Plots enabled, the series with datapoints inside the zoomed region are indicated with green font in the Select Sets/Variables to View grid and placed on the top of the list. There are additional options available on right clicking the chart, as described below.
Top of Topic Actions Single Compound Single Set
Single Compound
By default, the variables are displayed by Single Compound. That means that you can display any variable (like compound, pseudo-compound, derived quantity, temperature, etc.) chosen in Select Variable grid, for the sets included in Select Sets to View grid. Single Set This action is used to display information for all marked compounds/pseudo-compounds/derived quantities in the Select Variables to View grid and for the chosen set in Select Variable grid. Top of Topic See Also: |