Access to Deviation Plots of experimental and predicted data from the EOS is provided by Double-Clicking a property.
Analogous plots can be made by accessing the property data through the Equations of State node in the Navigation Tree.
A factor to alter the statistical weight of the property during fitting. The user can modify (increase or decrease) these factors to alter the results of the fitting process.
Number of experimental plus predicted data points associated with the property.
Relative weight is a function that represents the relative importance of the property in the fitting process, and is calculated as the sum of the squared property values multiplied by their statistical weights (as determined by TDE).
Starting Error is the error function for the property before the most recent fitting, and is calculated as the sum of the squared deviations of the calculated values (with the EOS) from the experimental and predicted data multiplied by their statistical weights (as determined by TDE).
Current Error is the error function for the property after the last completed fitting cycle, and is calculated as the sum of the squared deviations of the calculated (with the EOS) values from the experimental and predicted data multiplied by their statistical weights (as determined by TDE).
The Current Error is updated during the fitting process.
Adequacy is a function that indicates how well the EOS represents the property, and is calculated as the average squared deviation of the calculated value (with the EOS) from the experimental and predicted data multiplied by their statistical weight (as determined by TDE).
Smaller values indicate good representation of the property by the EOS. Values much greater than 1 indicate relatively poor representation of the property.
Colors ease interpretation. The property line is displayed with 4 possible colors, depending on the Adequacy value.
black if <1, green if < 3, blue if < 30, and red if > 30.
A user can choose beween two fitting methods: simplex (faster) and simulated annealing (slower, but sometimes better).
A selection is made by TDE depending on the type of EOS and amount of data. The user can change the selection.
Refresh re-calculates the current error and adequacy functions.
This might be of interest after modifying the experimental and predicted data used for fitting.
Fit starts (or continues) the fit of the selected EOS to the experimental and predicted property data.
Constraints are pseudo-properties used for calculation of the contributions to the error function of certain deviations from a well-formed EOS (i.e, one that ensures a correct functional shape for the T and p dependent properties.) They are used for fitting multi-parameter EOS that are not well-formed by definition through their mathematical structure
.
Close the EOS Control Center.
