Table 6. Population, sample size and response rate indicators.

	Size	Rate
Population size: worldwide number (head counts) of researchers, based on [ 2, p. 31]	7.8 M
Sample size: estimation of total number of people targeted by survey distribution; breakdown: - Twitter, direct (@ tweets, estimated) - Twitter, indirect (general tweets, estimated) - Mailing lists (not deduplicated) - Others (blogs, meetings) (estimated) - Distribution by custom URL partners (estimated), among which: - - Universities - - Publishers - - Hospitals - - Others	~1.4 M 2700 8773 25799 7000 ~1.3 M 155921 1136401 6333 17033	~18% (=relative sample size)
Response size	20663	1.5% (= response rate)