New Zealand's GDP Revisions Show Initial Estimates Can Change Significantly Over Time
New Zealand's GDP revisions show that initial quarterly estimates are subject to change over time. Stats NZ, the national statistical office, compiles GDP data using the best available information at the time of publication. This includes statistics on overseas trade, manufacturing, retail, building activity, business prices, and employment.
As more detailed and higher-quality data becomes available, GDP estimates are revised to reflect these changes. This process is normal and ensures that the best available data is published to accurately represent the economy's performance.
Revisions can also occur due to improvements in measurement methods or seasonal adjustment. Seasonal adjustment involves breaking down a series into trend cycle, seasonal, and irregular components, which can change over time as new data becomes available.
The revisions triangle provided by Stats NZ shows how estimates have changed over time for each quarter since September 2014. This transparency helps users understand the accuracy of GDP data and make informed decisions.