Table 5
Revision summary statistics, quarterly real gross domestic product growth rate

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  1981 to 1990 1991 to 2000 2001 to 2007 1981 to 2007
Number of quarters 40 40 28 108
  percentage points
Range of revisions  
Minimum value
-1.47 -0.93 -0.47 -1.47
Maximum value
0.93 0.75 0.37 0.93
Range that 90% of revisions lie within  
Minimum value
-0.94 -0.55 -0.40 -0.42
Maximum value
0.89 0.57 0.36 0.54
Median revision (median bias) 0.14 0.10 0.03 0.09
Mean revision (mean bias) 0.06 0.07 0.01 0.05
Variance 0.29 0.14 0.06 0.17
Standard deviation of revisions 0.54 0.37 0.24 0.41
Mean absolute revision (mean dispersion) 0.42 0.31 0.20 0.32
  percentage points
Share of negative revisions 40.0 40.0 46.4 41.7
Relative bias (mean revision divided by mean absolute growth rate) 6.0 8.4 1.7 6.1
Relative dispersion (mean absolute revision divided by mean absolute growth rate) 40.5 35.5 30.7 36.8
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