Neither the finance ministry nor the Central Statistics Office (CSO) is likely to be a winner in the dispute over gross domestic product (GDP) numbers for the current financial year. The provisional numbers of GDP data for the current financial year, to be out on May 31, are likely to fall between five and 5.5 per cent.
When CSO came out with advance estimates of five per cent economic growth for the current financial year, it surprised the finance ministry as much as that it had issued a press statement to say growth would be at least 5.5 per cent when the actual data came. The ministry said CSO based its advance estimates on the data till November or December, depending on availability. This, according to the ministry, makes its estimates accurate when GDP growth is following a trend, but not when it is turning. The ministry believed the economy would see a positive impact of reform measures it had taken since September 2012.

Source - http://www.business-standard.com