Industrial production index
IPI
IPI
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Sommaire
Précision et fiabilité
Overall accuracy
There is a trade-off between accuracy and timeliness. Thus, the monthly production indices are provisional.
They comprise around 10% of estimated data.
Errors are mainly due to incorrect reports of the legal units and imputation errors.
The results are normally final 95 days after the end of the month.
Sampling error and A1. Sampling errors – indicators for U
Not available but limited
Non-sampling error and A4. Unit non-response - rate for U and A5. Item non-response - rate for U
Response rate: Around 90% each month.
Actions to speed up or increase the rate of response: Phone or mail recall, (rarely) penalties and increased use of internet for data collection.
Non-sampling errors are due to the firms’ delayed reponses or the non exhaustive coverage (small firms are not included in the statistic population).
Coverage error
Units with fewer than 20 employees and those in which none of the industrial branches exceeds €5 million in annual turnover are not covered by the sample.
Measurement error
The measurement error is small: this would be due to inaccurate reporting not identified in the data clearance process.
Non response error
Response rate: Around 90% each month.
Processing error
The process is robust and uses cross-validations methods.