You can perform a sensitivity analysis by entering multiple values for a particular input variable. HOMER repeats its optimization process for each value of that variable and lets you see how the results are affected. An input variable for which you have specified multiple values is called a sensitivity variable, and you can define as many sensitivity variables as you want.
A sensitivity analysis can be referred to as one-dimensional if there is a single sensitivity variable. If there are two sensitivity variables, it is a two-dimensional sensitivity analysis, and so on. HOMER's most powerful graphical capabilities were developed to help examine the results of sensitivity analyses of two or more dimensions.
For more information, see Why Would I Do a Sensitivity Analysis?