Downloads - empirica

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Downloads - empirica

e-Business in the chemical, rubber and plastics industrysmall population). Employment-weighted data for this industry therefore have lowerstatistical accuracy than for the other sectors.The calculation of confidence intervals is based on the assumption of (quasi-) infinitepopulation universes. In practice, however, in some industries and in some countries thecomplete population of businesses consists of only several hundred or even a few dozenenterprises. In some cases, every enterprise within a country-industry and size-band cellwas contacted and asked to participate in the survey. This means that it is practicallyimpossible to achieve a higher confidence interval through representative enterprisesurveys in which participation is not obligatory. This should be taken into account whencomparing the confidence intervals of e-Business Watch surveys to those commonlyfound in general population surveys.Exhibit A1-7: Confidence intervals for the sector surveys (EU-7)Confidence intervalSurvey if weighted as if weighted byresult "% of firms" employmentunweightedSectors (aggregate, EU-7)Chemical, rubber and plastics 10% 8.0% - 12.4% 6.5% - 15.0% 8.4% - 11.9%Steel 10% 7.5% - 13.2% 4.8% - 19.6% 7.7% - 13.0%Furniture 10% 8.0% - 12.5% 7.1% - 14.0% 8.2% - 12.1%Retail 10% 7.0% - 14.0% 7.0% - 14.1% 8.6% - 11.7%Transport & logistics 10% 7.0% - 14.1% 7.4% - 13.4% 8.5% - 11.7%Sectors (aggregate, EU-7) 30%Chemical, rubber and plastics 30% 26.8% - 33.5% 24.0% - 36.8% 27.4% - 32.7%Steel 30% 25.8% - 34.5% 20.3% - 42.0% 26.1% - 34.2%Furniture 30% 26.7% - 33.5% 25.0% - 35.5% 27.1% - 33.0%Retail 30% 25.0% - 35.6% 24.9% - 35.7% 27.7% - 32.4%Transport & logistics 30% 24.9% - 35.7% 25.7% - 34.7% 27.7% - 32.4%Sectors (aggregate, EU-7) 50%Chemical, rubber and plastics 50% 46.3% - 53.7% 43.0% - 57.0% 47.1% - 52.9%Steel 50% 45.2% - 54.8% 38.2% - 61.8% 45.6% - 54.4%Furniture 50% 46.3% - 53.7% 44.3% - 55.7% 46.8% - 53.2%Retail 50% 44.2% - 55.8% 44.1% - 55.9% 47.4% - 52.6%Transport & logistics 50% 44.1% - 55.9% 45.1% - 54.9% 47.4% - 52.6%Sectors (aggregate, EU-7) 70%Chemical, rubber and plastics 70% 66.5% - 73.2% 63.2% - 76.0% 67.3% - 72.6%Steel 70% 65.5% - 74.2% 58.0% - 79.7% 65.8% - 73.9%Furniture 70% 66.5% - 73.3% 64.5% - 75.0% 67.0% - 72.9%Retail 70% 64.4% - 75.0% 64.3% - 75.1% 67.6% - 72.3%Transport & logistics 70% 64.3% - 75.1% 65.3% - 74.3% 67.6% - 72.3%Sectors (aggregate, EU-7) 90%Chemical, rubber and plastics 90% 87.6% - 92.0% 85.0% - 93.5% 88.1% - 91.6%Steel 90% 86.8% - 92.5% 80.4% - 95.2% 87.0% - 92.3%Furniture 90% 87.5% - 92.0% 86.0% - 92.9% 87.9% - 91.8%Retail 90% 86.0% - 93.0% 85.9% - 93.0% 88.3% - 91.4%Transport & logistics 90% 85.9% - 93.0% 86.6% - 92.6% 88.3% - 91.5%confidence intervals at α=.90218

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