simulation models - worst case/Monte carlo models

[sachinsk]

Hi,

I know somethings about worst case analysis,Monte carlo analysis.
I do these simulations using standard spice models available in Library.
What i know is the simulation tool will vary the component parameters automatically during these analysis and gives the results.

My question is , do we get special models like Monte carlo models/worst case simulation models separately?
Means models which have more variation in its parameters compared to standard models.

Do manufacturer provides these kind of models?

Thanks
Sachin