DATA COVERAGE STUDY AND CALCULATION OF CONCENTRATION RATIO

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  • IWAMATSU Jun
    Senior Researcher, Research Institute on Building Cost (RIBC), Dr. Eng.

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Other Title
  • カバレッジの検討と市場集中度の分析
  • カバレッジの検討と市場集中度の分析 : ミクロデータに基づく建設業の構造分析(その1)
  • カバレッジ ノ ケントウ ト シジョウ シュウチュウド ノ ブンセキ : ミクロデータ ニ モトズク ケンセツギョウ ノ コウゾウ ブンセキ(ソノ 1)
  • Analysis of the construction industry using the Business Evaluation micro data Part 1
  • ミクロデータに基づく建設業の構造分析　その１

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Abstract

In the recent Japan, some statistics and results of investigations which cover plenty of construction companies become available in the form of digital data. This research uses them, and analyzes and understands the overall picture of Japan's construction industry. Especially in this analysis, the Business-Evaluation results (BERs) created and released under the Construction Business Act is used mainly. Since most public purchasers use this evaluation, many of construction companies take it every year. The number of micro data obtained as of March 2012 was 147,152. The contents of data released are corporate profiles, evaluation points, amount of completed works and number of engineers, labor welfare situations, and financial conditions.<br>The coverage of BERs is examined by contrast with the Construction License information or the total value of completed work amount of the Statistics on Construction Undertaken. This analysis is conducted according to prefectures or construction work types. In some construction work types, it turned out that the coverage of BERs is comparatively high. The concentration ratios are calculated on the main construction work types with high value of coverage.

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