Annual Export Duration for 6 digit HS Code

The dataset reports the export spells based on annual export data from the Comtrade Database. The dataset is based on imports as it is widely acknowledged in the literature that countries report their import data more completely and with less error. The first column reports the number of months a bilateral trade relationship is either active or not active. The second column is the status of the trade relationship, 1 if active and 0 if not active. The third column gives the identifier for the bilateral trade relationship, in the order of exporter country, importer country and the 6 digit HS commodity code. Internal trade flows are also included.本数据集依托联合国商品贸易统计数据库（Comtrade Database）的年度出口数据，统计出口贸易关系持续时长。 本数据集以进口数据为统计基础，因现有学术研究普遍认为，各国报送的进口数据更为完整且误差率更低。 第一列为双边贸易关系的持续月数，用于标识该关系处于活跃或非活跃状态。 第二列为贸易关系状态：活跃时取值为1，非活跃时取值为0。 第三列为双边贸易关系标识符，排序依次为出口国、进口国以及6位协调制度商品编码（HS）。 数据集同时涵盖国内贸易流量。