Changing the Distribution Criteria for Every Statistical Setup
Follow this procedure to change the default distribution criteria for every statistical setup:
- Make sure that the variable's distribution criteria are not overridden in any statistical setup.
- If the variable is a design variable, do the following: On the Twin Builder menu, click Design Properties.
If the variable is a project variable, do the following: Select Project > Project Variables.
The Properties dialog box appears.
- Select Statistics.
- Click the Distribution column for the variable you want to change, then select Uniform, Gaussian, Lognormal, or User Defined.
- Optionally, if you want to change the distribution criteria, click in the Distribution Criteria column for the variable to change.
If the distribution type is Gaussian, the Gaussian Distribution dialog box appears. If the distribution type is Uniform, the Uniform Distribution dialog box appears.
- If the distribution type is Gaussian:
- Type a cutoff probability value in the Cutoff Probability text box.
- Type the standard deviation in the Std. Dev text box.
- Type the mean value of the distribution in the Mean text box.
Twin Builder will solve design variations using a Gaussian distribution within the low and high cutoff values.
- If the distribution type is Uniform:
- Type a cutoff probability value in the Cutoff Probability text box.
- Type mean and tolerance values in the corresponding text boxes.
Twin Builder will solve design variations within the tolerance range of the starting value, using an even distribution.
- If the distribution type is Lognormal:
- Type a cutoff probability value in the Cutoff Probability text box.
- Type values for Sigma, M, and Theta in the corresponding text boxes.
- If the distribution type is User Defined:
- Type a cutoff probability value in the Cutoff Probability text box.
- Click Edit XY Data to open the Edit Dataset dialog box.
- Either type or import the X and Y data values for the distribution in the Edit Dataset dialog box.
- Click OK.