A Heretical View

My own view is that CF combination algorithms are not a major issue.

Question: How accurate does the computation in the middle need to be, given that the input data are only accurate to (say) ± 10%?

It's hard to argue that extreme accuracy in the computation is required.

Remember:

• Use CF's as a last resort, when a good guess is the best you can do.
• Never trust a CF to have more than one digit of accuracy.