Research Policy

The dataset presents the top 421 patents related to lithium-ion batteries as identified by a patents citation network analysis, which represents the core knowledge trajectory of the lithium-ion battery industry.

halo_rd and halo_educ are Stata files containing the data used for the regression tables; figrddata, fig3data, and fig4data were used to generate the figures in R/ggplot2. (rrrrcode.txt contains the replication code for tables and figures alike.)

The database is a novel and unbalanced panel of 657 startups in the U.S. cleantech sector between 2008 and 2012. The panel includes 2,015 alliances (2008 to 2012) of all U.S. startups interacting with other firms, government organizations, research institutes, universities, and other not-for-profit organizations from the U.S. and globally. The startups operate in one or more of the following 17 sub-sectors: solar, wind, biomass, geothermal, hydro and marine power, nuclear, energy storage, smart grid, energy efficiency, advanced materials, transportation, biofuels and biochemicals, conventional fuels, fuel cells and hydrogen, air, recycling and waste, or water and wastewater. We considered a firm to be a startup if it is younger than 5 years in year t, with t0 being 2008. In addition to the network data, the dataset includes information on the patenting activity and financial investments (number of financing deals) of the startups.

This is the main dataset that we used to test our hypotheses as stated in this paper.

see detailed in data file

Here is the data used in the paper titled "Does democracy cause innovation? An empirical study of the Popper Hypothesis". Democratic countries produce higher levels of innovation than autocratic ones, but does democratization itself lead to innovation growth either in the short or in the long run? The existing literature has extensively examined the relationship between democracy and growth, but seldom explored the effect of democracy on innovation, which might be an important channel through which democracy contributes to economic growth. This article aims to fill this gap and contributes to the long-standing debate on the relationship between democracy and innovation by offering empirical evidence based on a dataset covering 156 countries between the year 1964 and 2010. The results from difference-in-difference method show that democracy itself has no direct positive effect on innovation measured with patent counts, patent citations and patent originality.