Investigate needs for statistical modeling

[christianhaargaard]

Look into what is needed to be able to do statistical modeling inside the chef framework.
Work would include:

• How to specify the analysis
• Logistically managing the information needed for the model
• How to store the model object for re-evaluation - and inspection
• How to apply criteria-functions to results
• What happens if the model doesn't converge?
  • Can we test in advance? Can we return a value so chef doesn't break, but you still no there is a convergence issue.