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A CBO Report: CBO's Economic Forecasting Record. A Supplement to the Budget and Economic Outlook: An Update [i] (November 2002)

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                                               A
                                               CBO
                                            REPORT

                               CBO's Economic Forecasting Record
                  A Supplement to The Budget and Economic Outlook: An Update
                                        November 2002


Since publishing its first macroeconomic forecast in 1976, the Congressional Budget Office (CBO) h
compiled a forecasting track record comparable in quality with those of a sizable sample of private-
sector forecasters as well as five Administrations. CBO's errors for two-year forecasts made between
1982 and 2000 did not differ markedly either from those of the Administration or from the average of
50 or so forecasts that have made up the Blue Chip survey over the years. Comparing CBO's forecasts
with those of the Blue Chip consensus suggests that when CBO's economic predictions missed the ma
by a margin wide enough to contribute to sizable errors of the surplus or deficit, those inaccuracies
probably reflected limitations that confronted all forecasters. That result is not surprising because all
forecasters, when making their predictions, have the same basic information available about the state
the economy, which they may then interpret differently. Moreover, CBO examines other forecasts wh
constructing its own; in turn, CBO's forecast may affect others in a similar way.



Overview

For forecasts looking two years ahead--those that are most important for the budget year being
considered by the Congress--CBO's accuracy is essentially the same as that of the various
Administrations over the past two and a half decades. Even though CBO and the Administration usual
make different policy assumptions--CBO assumes a continuation of current policy and the
Administration normally incorporates the projected economic effects of its policy proposals--the
differences between the two forecasters are small, especially when compared with the size of the fore(
errors. Also, CBO's forecasts have been about as accurate as the Blue Chip's average forecasts, in gen(
(see Table 1).

Table 1.
Summary Measures of Forecast Performance (In percentage points)

                                                   CBO      Administration Blue Chip

                                 Two-Year Averages

 Growth Rate for Real Output (1982-2000)


Mean error


-0.6


-0.4         -0.6

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