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关注：1
2013-05-23 12:21
求翻译：fragmentary R&D histories or no R&D spending at all were, as in earlier studies (e.g., Hall et al. , 2007), treated with a dummy variable. This approach is further substantiated by Hall and Oriani (2006), who found that no sample selection bias was induced是什么意思？ 待解决
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fragmentary R&D histories or no R&D spending at all were, as in earlier studies (e.g., Hall et al. , 2007), treated with a dummy variable. This approach is further substantiated by Hall and Oriani (2006), who found that no sample selection bias was induced
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