Tolerances can be assigned to the circuit elements for use in Monte-Carlo or worst-case analyses. The results can be evaluated statistically using expected means, standard deviations, and yields. Moving the cursor onto a particular curve retrieves the corresponding component values so that extreme results may be interpreted. The tolerance models provided for each component allow uniform, Gaussian, or general distribution. Using general distribution, you can define asymmetric tolerance as well as group tolerance. With group tolerance, you can even model negative tracking, where the component values of one group will be changed in the opposite direction of the other group.