Technology Link Database
used in "Technological links and predictable returns" (2019)
The following is the techlink database we used in our paper (in STATA format). The data includes pairwise technology similarity between firms from 1926-2010.
The variables include:
1) patyear: the year end we identiy technology similarity
2) permno: Datastream primary permno for the focal firm
3) permno1: Datastream primary permno for the peer firm
4) nissyear: number of years the focal firm issued patents in the past 5 years
5) nissyear1: number of years the peer firm issued patents in the past 5 years
6) tec: technology similarity between firms
Please cite our paper if you find the data useful: Lee, C. M., Sun, S. T., Wang, R., & Zhang, R. (2019). Technological links and predictable returns. Journal of Financial Economics, 132(3), 76-96.