|Unit||Index 2015=100, NSA|
|Adjustments||Not Seasonally Adjusted|
For Vietnam, the Main Industrial Products released by the General Statistical Office (GSO) is based on the volume of production. It covers the following industries: mining, manufacturing, electricity, gas and water supply.
From 2008, the GSO publishes two types of IPI at once, as follows:
First, the monthly IPI is calculated based on the indicator "gross industrial output at constant 1994 prices" which has been published for many years. The IPI measures changes in physical production volume, detailed by groups of commodity industries. Currently, output is recorded at producers' prices. The volume data are collected monthly from all state-owned enterprises. The data for other enterprises are estimated based on the results of sample surveys. The response rate of selected enterprises is around 90 to 95 percent. The missing data are estimated by using growth in closely related enterprises that have responded.
Second, the new Industrial Production Index uses the base year of 2015. The new index measures changes in the volume of main industrial products with the weight of value added. The new index is calculated from the data of a selected sample of establishments. The sample is selected at 3 levels with at least 75% representation for 3 industries at one digit:
The response rate for selected establishments is around 92 to 95 percent.
Moody's Analytics extends the headline series using the source's reported predecessors. The source also reports an annual average year-over-year index for each year. We use these figures and apply them backward to ensure that each annual average is at the correct level relative to the latest reported data. Because we prioritize the year-over-year indexing, the annual average for 2015 does not exactly equal 100.
Data is revised when new data becomes available.
Monthly estimates are released on the 24th or 25th of the reference month.