Setting Up a Statistical Analysis
Follow this general procedure to set up a statistical analysis. Once you have created a setup, you can Copy and Paste it, then make changes to the copy, rather than redoing the whole process for minor changes. You can create a statistical setup before defining variables but all variables must be defined before you start the statistical analysis.
A statistical analysis is currently limited to using a maximum of 30 variables.
- Before a variable is included in a statistical analysis, you must specify that you intend to use it during a statistical analysis in the Properties dialog box.
- Select Twin Builder > Optimetrics Analysis > Add Statistical
. The Setup Statistical Analysis dialog box
appears.
- Under the Calculations tab, type the maximum number of iterations for Twin Builder to perform in the Maximum Iterations text box.
- If you want to specify an initial seed value, select the Specify initial seed value check box and enter a positive value in the text box. Each different seed value creates a new statistical sequence.
- Specify a solution quantity to evaluate.
- In the Calculation text box, set the value at which the solution quantity is to be computed.
- Optionally, modify the distribution criteria to use.
- The following optional statistical analysis setup options can also be used:
- Modify the starting variable value.
- Exclude variables from the statistical analysis.
- Modify the values of fixed variables that are not being modified during the statistical analysis.
- Request that Optimetrics solve a parametric sweep during
a statistical analysis.
Note:
Sweeping or using a complex variable is not allowed in any optimetrics setup, including optimization, statistical, sensitivity, and tuning setups.
- Set HPC and Analysis Options to select or create an analysis configuration. Enable a fast calculation-update algorithm to speed up
Optimetrics and report updates during Optimetrics analyses. By default,
the fast calculation-update option is enabled whenever
it is applicable.
Note:
Improper or undefined simulation setups will cause errors during Statistical Analysis. To verify the analysis setups, click Analysis > Analyze in the Project Manager pane to analyze the nominal circuit and review the messages in the Message Manager pane prior to running the Statistical Analysis.