Funding for this research was provided by:
National Science Foundation (SES-0752760)
Text and Data Mining valid from 2019-11-21
Received: 16 February 2019
Accepted: 28 October 2019
First Online: 21 November 2019
Compliance with ethical standards
: Tomas Lichard and Jan Hanousek declare that they have no relevant or material financial interests that relate to the research described in this paper. Randall Filer declares that he has no relevant or material financial interests that relate to the research described in this paper. He was the principal investigator of the NSF grant cited in the paper (#SES-0752760, awarded to the Research Foundation of the City University of New York). None of the authors declares any conflict of interest.
: No other party had the right to review the paper prior to its circulation. Our research paper/methodology is not involved on the collection of data on human and/or animal subjects. Data we use has been collected by local statistical offices, following Eurostat rules/methodology and code of ethics.