Common use of Survey methodology and description of respondents Clause in Contracts

Survey methodology and description of respondents. The survey was sent to members of the Leiden PhD Association (LEO) and to the Leiden academic network of the 2012 ▇▇▇ board. The survey was open for almost two months: from 23 November 2012 until 21 January 2013. The complete questionnaire can be found in appendix 6. A total of 218 responses from Leiden University PhD candidates was received, after removal of duplicates. Duplicates were removed by checking the IP addresses of the respondents and whether answers given by the same IP address were identical or very similar. The most complete responses were kept.5 No precise response rate could be calculated, as recipients of the survey invitation were encouraged to forward the invitation to colleagues and friends who were also doing a PhD at Leiden University. Two thirds of PhD candidates were employed at Leiden University, and thus characterized as internals (Table 1). PhD candidates from the sciences constitute the largest group among the respondents, followed by the humanities, social and behavioural sciences, law, and other fields. Almost half of the respondents were in the first two years of the PhD at the time of the survey. Finally, the ratio between males and females is almost one-to-one, as is the ratio between Dutch and non-Dutch respondents. Some of these background variables are correlated with each other (Table S1 in appendix 6). For example, the largest group of internal respondents is working in the science faculty. The opposite is true for the humanities faculty, with many 5 Not all responses with identical IP addresses were removed. In our original dataset, we found IP addresses with up to five responses. When assessing the answers of identical IP addresses, we found that these were often very different. Hence, it is likely that multiple PhD candidates used the same computer to fill in the survey. external PhD candidates working in this faculty. Furthermore, non-Dutch PhD candidates are more likely to be externals. Table 1. Descriptive statistics survey sample

Survey methodology and description of respondents. The survey was sent to members of the Leiden PhD Association (LEO▇▇▇) and to the Leiden academic network of the 2012 ▇▇▇ board. The survey was open for almost two months: from 23 November 2012 until 21 January 2013. The complete questionnaire can be found in appendix 6. A total of 218 responses from Leiden University PhD candidates was received, after removal of duplicates. Duplicates were removed by checking the IP addresses of the respondents and whether answers given by the same IP address were identical or very similar. The most complete responses were kept.5 No precise response rate could be calculated, as recipients of the survey invitation were encouraged to forward the invitation to colleagues and friends who were also doing a PhD at Leiden University. Two thirds of PhD candidates were employed at Leiden University, and thus characterized as internals (Table 1). PhD candidates from the sciences constitute the largest group among the respondents, followed by the humanities, social and behavioural sciences, law, and other fields. Almost half of the respondents were in the first two years of the PhD at the time of the survey. Finally, the ratio between males and females is almost one-to-one, as is the ratio between Dutch and non-Dutch respondents. Some of these background variables are correlated with each other (Table S1 in appendix 6). For example, the largest group of internal respondents is working in the science faculty. The opposite is true for the humanities faculty, with many 5 Not all responses with identical IP addresses were removed. In our original dataset, we found IP addresses with up to five responses. When assessing the answers of identical IP addresses, we found that these were often very different. Hence, it is likely that multiple PhD candidates used the same computer to fill in the survey. external PhD candidates working in this faculty. Furthermore, non-Dutch PhD candidates are more likely to be externals. Table 1. Descriptive statistics survey sample