IECM 12.0 beta User Manual > Using the IECM > Setting Parameters > Parameter Screens > Uncertainty Editor >

Uncertainty on Menus

It may seem counter-intuitive, but it is possible to put uncertainty on a menu parameter. Menu parameters are implemented internally as an index into a list of possible values. If the parameter you're working with is a menu , the distribution information will be narrower, and a list of possible values for the menu will appear to its right. For example, this is the list of possible values for the Plant Location:

•1 = "US Midwest Region"

•2 = "US Northeast Region"

•3 = "US Northwest Region"

•4 = "US South Central Region"

•5 = "US Southeast Region"

•6 = "US Southwest Region"

•7 = "Australia"

•8 = "Canada"

•9 = "China"

•10 = "Eastern Europe (Poland)"

•11 = "India"

•12 = "Japan"

•13 = "Middle East (Egypt)"

•14 = "Netherlands"

•15 = "South Africa"

•16 = "South America (Brazil, Chile)"

•17 = "Southeast Asia (Indonesia)"

•0 = "Other"

The IECM will map samples onto the nearest valid value, so any distribution may be used. However, it generally makes the most sense to use a user-defined distribution with nominal values and specify the values you're interested in.

If you're looking at a menu parameter in isolation, it may be simpler to do a Sensitivity Analysis.

Note:

The numeric values associated with menu options are the values used internally. They may be in a logical order, as in the example above, but this is not guaranteed. For example, there may be gaps that correspond with options that are no longer supported and/or not relevant in the current context.