The Department of Statistics has been releasing GDP advance estimates publicly since the middle of last year. The next advance quarterly release is set for next week on October 21 and that will mark one year since the practice began. The actual Q3 GDP numbers themselves will only be made available publicly in mid-November.
I want to highlight that advance releases do three things in the market.
First, it messes up almost everybody’s forecast rounds and their plan for press exposure. I know more than a few economists are still gearing their forecast process around actual GDP release date instead of that of advance estimate. While this is understandable as many are waiting for various data to come out before making their final quarterly GDP forecast, this leaves consensus numbers being gathered after advance estimates are out, which in turn makes consensus outdated and less informative than it used to. After all, who would be impressed when a forecast is released after the advance estimates?
Second, maybe there is still a room to be had to keep existing forecast processes since there are errors to the advance releases. But here so far, average error has been minimal. Mean absolute error for the past three quarters were only 0.25 percentage point, although the largest error is quite big. Currently, the absolute error for individual quarter that we have are:
- Q3 2023: 0.17 percentage point (ppt)
- Q4 2023: 0.43 ppt
- Q1 2024: 0.28 ppt
- Q2 2024: 0.10 ppt
But the two points I think are minor concerns. The first is a mere inconvenience and easily rectifiable, although it necessarily leads to more work. For the second point, I have some confidence the MAE will get smaller in the future.
The third point is more important: advance releases increase transparency in data and therefore confidence in public institutions. As much as there is science behind the GDP data collection and processing, there are still subjective decisions need to be made in finalizing the numbers. These decisions however subjective are mostly innocent but it does leave space for abuse in some circumstances. Advance releases limit that room for subjectivity by anchoring the final numbers to the former numbers.