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大家来看一看：这篇文章是香港大学zheng-zhou , Yong Gao, Hongxin Zhao 做的，高度怀疑这个数据有问题。他们可能是用一年的书补齐其他年份的。这个数据是只有050607年研发数据，他们数据处理一定有没有说出来的重大问题。
1.统计局规模以上企业数据是否有01-07年新产品的连续变量？
2.统计局规模以上企业数据是否有01-07年研发数据的连续变量？
We used data from the Annual Census of Chinese Industrial Enterprises (2001–
2007), conducted by the National Bureau of Statistics of China. This database
contains detailed information about manufacturing firms operating in China,
such as their ownership type, industry, assets, liabilities, capital structure, and
financial performance. The annual census covers all SOEs and non-SOEs
whose annual sales are at least 5 million RMB (about US$685,000 in 2007),
thus providing a comprehensive coverage of SOEs in China. Research in strategy
and international business often uses it as a reliable source of information
about firms operating in China (e.g., Gao et al., 2010; Xu, Lu, and Gu, 2014).
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