On 3 October 2011, we offered the following forecast for where GDP in the third quarter of 2011 would be recorded:
Assuming that the deviation between our modified limo forecast value and actual GDP can be described by a normal distribution, we estimate a 68.2% probability of the BEA recording real GDP for 2011-Q3 somewhere between $13,160.1 billion and $13,439.5 billion, and a 95% probability of it falling between $13,020.4 billion and $13,579.2 billion. There is a 99.7% probability of 2011-Q3's GDP figure being recorded somewhere between $12,880.8 billion and $13,718.8 billion.
Although only the first advance estimate of GDP for 2011Q3 has been released so far, here's the tale of the tape:
Real GDP in 2011-Q3 was well within our forecast range, as the advance estimate for U.S. GDP in the quarter is $13,352.8 billion (in terms of constant 2005 U.S. dollars). Compared to the midpoint of our forecast range, $13,299.8 billion, the advance estimate for 2011-Q3 real GDP was just 0.4% higher.
Using the advance GDP estimate for the third quarter of 2011, which will be revised at least twice more before being "finalized" (pending later revisions), we can reasonably project that the inflation-adjusted value of U.S. GDP for the fourth quarter of 2011 to be between $13,275.3 and $13,556.7 billion (in terms of constant 2005 U.S. dollars). We estimate a near-70% probability of 2011-Q4 GDP falling between these values.
We project a 99.7% likelihood that 2011-Q4 GDP will be between $12,994.0 and $13,838.0.
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