The ministry further said "it needs to be appreciated" that every revision in the estimates of GDP/GVA is based on the data available at the time of the respective release.
The coverage and quality of each data source - like revenue expenditure, taxes, and company filings data - improve over time.
Till the release of provisional estimates in any year, the estimates are based on indicators like the Index of Industrial production (IIP), wholesale price indices, core sector data on steel, cement, electricity, revenue expenditure, GST data, trade data on imports and exports, consumer prices, among others, it said.
The estimates based on indicators are reworked when the corresponding data source becomes available. By the time of the Third Revised Estimate, the coverage and completeness in the data sources are almost final and no further revision takes place, the ministry said.