Annual

EACEI 2016 was collected via the internet and possibly by post (at the request of the establishment).

The collection period extended from January to May 2017 (main sample).

Local unit (of an enterprise)

The sampling frame is the Sirus directory (system of identification to directory of statistical units).
The sampling method is a stratified plan by the nomenclature of activities (NTE) dedicated to energy consumption, workforce bands, and region.
Allocations are optimised on the NTE x workforce bands, and on net energy consumption, taking into account the average dispersion per stratum over the last 3 years. The allowances are exhaustive above the threshold of 250 employees, big consumers of energy and for strata of less than 10 units.

 The sample includes approximately 8,500 establishments.

• Checks during the collection phase: checks on internal coherence and temporal coherence in the form of an alert at the time of data entry;
• Follow-ups during the collection phase: exhaustive reminders by mail on non-respondents, priority telephone reminders on large non-respondents;
• Data cleaning to ensure consistency of answers within each questionnaire;
• Calculation of precision indicators.