The government on Thursday formally admitted it had faltered on industrial growth data for January by overestimating sugar production more than two times.
The government said it was a "one-off aberration".
The January industrial growth figure was drastically revised down to just 1.1 per cent against the earlier 6.8 per cent.
That led government advisors, economists and industry players to raise questions over the very relevance of the Index of Industrial Production data.
The goof-up could be bigger and data in other commodities are likely to have been misreported as well, since sugar has just 1.5 per cent weight in the IIP, economists say.
It can explain less than half of the 5.7 percentage-point over-reporting in the provisional index for the month of January.
This was the third blunder in government data collection in a year and a half, the two other being on exports last year and GDP numbers for the first quarter of 2010-11.
Meanwhile, provisional February industrial growth stood at a lacklustre 4.1 per cent, against 6.7 per cent a year ago. It was driven mostly by capital goods, a volatile component in IIP.
The low final January figure and moderate industrial growth in February would both have a bearing on the monetary policy, finance minister Pranab Mukherjee said.
He said the finance ministry and the Reserve Bank of India would work together to take steps to revive the investment climate.
That raised hope of a rate cut by the central bank. The Reserve Bank will come out with its monetary policy for 2012-13 on April 17.
In January, sugar production was wrongly taken as 13.41 million tonnes in January against the actual figure of 5.8 million tonnes. Processed food production was initially shown to have risen 92.6 per cent in January.
"My guess is 95 per cent of the change is on account of sugar.
"There may be some small adjustments, which may be on account of other reports," chief statistician T C A Anant told reporters.
"Sugar has just 1.5 per cent weight in IIP, but if you multiply 1.5 per cent with a certain number, the size makes the difference," Anant said.
But, can an item with just 1.5 per cent weight in the index pull down the overall figure from 6.8 per cent to just 1.1 per cent?
"Yes, it can," said former chief statistician and currently principal advisor to the Planning Commission, Pronab Sen.
However, other economists did not agree.
Chief economist of the Federation of Indian Chambers of Commerce and Industry Soumya Kanti Ghosh said only 2.4 percentage points of the 5.7 percentage-point downward revision in January could be explained by sugar misreporting.
There may be misreporting in other products in consumer non-durable goods, otherwise that sector's growth could not have been revised to just 11 per cent from the earlier 42.1
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