Table 3 Variables (X) considered in Poisson regression
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 |
| Â | Age | Number of months until 2007 |