![]() ![]() Given the rather large size of our sample, the precision problem could be dismissed without further arguments. This refers to the variability in the responses and is most relevant for small sample size surveys. However, none did complain about question 1 and 2.Ī third point of concern is the precision of the measurement. Those that answered the question complained about the length of the questionnaire and especially the section on measuring competencies included in it and appearing right before question 1 and 2 above. The last question of the survey was an open question about the respondent's opinion about the questionnaire. We do not think that this will be a problem as we may argue that preferences for R&D and non-R&D functions are the same for mathematicians from technical and non-technical universities. Since graduates from natural sciences disciplines at non-technical universities (mathematics, physics etc.) do not have the title Ingenieur (Ir) they are generally not members of KIVI NIRIA (although they may be subscribers of Technisch Weekblad) and will generally not be in the data. Individual members get advice on (individual) salary negotiations. KIVI NIRIA is a professional organization that looks after the interests of Dutch scientists and engineers and provides services that assists members with the development of their professional careers, for example, an individual's advices on salary negotiations. ,, it is impossible if workers’ characteristics are mapped on employers’ characteristics. International Economic Review, 29: 157– 66. Efficient estimation of structural hedonic systems. Journal of Political Economy, 95: 59– 80. Hedonic prices and implicit markets: Estimating demand and supply functions for differentiated products. The Review of Economics and Statistics, 69: 178– 80. Estimating hedonic demand parameters with single market data: The problems caused by unobserved tastes. In fact, as pointed out earlier in the hedonic price literature by Bartik (1987) Bartik, T. ,, , 119, footnote 5) stated that: ‘(… finding instruments for Z (read RD in our case) that are not themselves X's (read x) would be extremely difficult)’. Quarterly Journal of Economics, 94(1): 113– 34. Equalizing differences in the labor market. Refering to this problem, Brown ( 1980 Brown, C. The wage could depend on x as well as on additional characteristics y that are unrelated to preferences for R&D and written as w j ( x, y) without changing the main structure of the model. ![]()
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