In addition, much of the information used by intelligence analysts is incomplete or unverified and may even be the result of a deliberate attempt to deceive. This messy, dirty, unstructured data requires a unique set of analytic methodologies. Traditional statistical methods often don't work, for example, with the kinds of anecdotal data normal in intelligence work.
Of the two, decisionmakers typically value quality estimative intelligence over even the very best descriptive products. In a world dominated by a 24/7 news cycle and supported by the vast resources available on the internet, providing mere facts and figures is rarely enough to justify the expense of a dedicated intelligence unit.