Feature description

Hi @shajoezhu and team,

from the junco team's side I would like to propose two new methods as enhancements for the prop_diff functions:

• CMH using Miettinen-Nurminen method
  • See e.g. this PharmaSUG paper for details
• CMH using Sato variance estimator
  • See e.g. the SAS manual
  • 

If you agree then I will create 2 PRs for these 😄

Thanks,
best regards
Daniel

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