When a 20 percent soda tax is recomputed according to a dynamic model, a 20-pound loss after five years turns into a four pound loss (assuming, that is, every other assumption in the tax model is also correct).

FORBES: New Survey: Majority Of Americans Oppose Soda Tax; Support Strongest Among The Young, The Wealthy And The Thin

Anyway, after we had a chance to amend the initial forecasts, the Board staff recomputed the ranges and central tendencies, and often omitted outliers before they become part of the official FOMC record and, these days, announced at a press conference.

FORBES: The Sausage-Making Behind FOMC Forecasts