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

摘要

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. 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.%建設業の母集団に近いカバレッジをもつ大標本データ（約15万社）であるといってよい経審データ（経営事項審査結果）の公表や全ての建設業許可情報（ただし、公表内容は一部のみ）の公表等によって、これまで統計作成者によって集計された公表統計の加工利用だけで語られてきた建設業の構造についての分析を、統計的な意味において比較的精密に議論することが可能な状況が実現しつつある。