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Hi,

There is some documentation for PAT 2.0 that provides some explanation -- scroll down a bit to the section where it lists Argument, Discrete, Continuous, and Pivot. As PAT 2.0 now includes the same capabilities that were available in the analysis spreadsheet, the same description applies. I'll paste it here as well:

1. Argument - Fixes the quanity as a static value for the analysis.
2. Continuous - Assigns a continuous probability density function to a variable. Available distributions include uniform, triangular, normal, and log normal.
3. Discrete - Allows the user to specify a specific set of distinct values with associated weights.
4. Pivot - Forces the entire analysis to be performed against each specified value. e.g. An analysis problem with 25 samples and 3 pivots would create a total of 75 data points.

Note that a Variable in the analysis spreadsheet could either be of type Continuous or Discrete.