• 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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