- 4 Aggregate estimates of the size of the security industry
- 4.1 Overview of approach
- 4.2 Method for the estimation of aggregate turnover and employment for the surveysample
- 4.2.1 Underlying assumptions
- 4.2.2 Estimation of turnover for non-declaring respondents
- 4.2.3 Estimation of employment levels for employment - size class ‘1000 or more employees’
- 4.2.4 Estimation of sample average values of employment and turnover per firm
- 4.3 Method for the initial estimation of aggregate turnover and employment
- 4.3.1 Underlying assumptions
- 4.3.2 Calculation of the initial estimate of the population of security companies
- 4.3.3 Calculation of initial estimates of aggregate (national) turnover and employment
- 4.4 Variants and sub-groups
- 4.5 Size of the security industry: survey estimates and aggregate (national) extrapolation
- 4.5.1 Estimates of the population of security companies
- 4.5.2 Comparison of estimators
- Annexes
- A.1. Product and services segmentation
- A.2. Market Segmentation
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