The Finance Minister Palaniappan Chidambaram said on Wednesday industrial output data for September was encouraging after August's poor result, but called for an improvement in data collection.
"I say this even while I maintain that data collection must be improved and made more relevant, contemporary and universal," a statement from the finance minister said.
India's industrial output rose 4.8 percent in September from a year earlier, data showed on Wednesday, above the previous month's upwardly revised 1.4 percent.
But analysts said annual expansion in October would probably drop as the global credit crisis raised borrowing costs for Indian firms.
The September figure was marginally above a forecast for growth of 4.7 percent in a Reuters poll of economists.