Not all Spice versions perform Monte Carlo simulations. Even those that do may only have a small number of available distributions, much less custom ones. LTSpice, for example, has built-in random distributions limited to Uniform and Gaussian (defined by sigma, but no specified limit). Unfortunately, this excludes many real-world distributions such as Gaussian (with maximums of 2-sigma, 3-sigma, etc.), bimodal, triangular, and U-shaped for example. A review of web reference shows few
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