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Table 3 Variables (X) considered in Poisson regression

From: Effects of research tool patents on biotechnology innovation in a developing country: A case study of South Korea

Classification Variable Definition
Independent variable Innovation performance Total number of patents
Dependent variable Degree of difficulty in acquiring research tools 1 = very easy; 2 = easy;
3 = neither easy nor difficult;
4 = difficult; 5 = very difficult
Control variable Size Log number of employees in 2007
  Age Number of months until 2007