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Four Essays on University Economics - KOPS - Universität Konstanz

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Return of foreign students<br />

Table 3.3: Descriptive statistics c<strong>on</strong>cerning the return date<br />

KAAD return date<br />

program total number known (share) censored (share)<br />

All 2436 1480 (60.76 %) 956 (39.24 %)<br />

Program 1 1276 681 (53.37 %) 595 (46.63 %)<br />

Program 2 278 84 (30.22 %) 194 (69.78 %)<br />

Program 3 882 715 (81.07 %) 167 (18.93 %)<br />

which correlate positively with the inclinati<strong>on</strong> to report the return, might, thus, have a<br />

spurious correlati<strong>on</strong> with the dependent variable.<br />

3.4.2 Explanatory Variables<br />

Individual Factors<br />

The data set c<strong>on</strong>tains the student’s date of birth, the dates of arrival in Germany and of<br />

the end of the study period. From this data we can calculate the time a student spent<br />

in Germany and the student’s age at the end of the study period. On average, students<br />

stayed for 44 m<strong>on</strong>ths in Germany. The average age of graduates in our sample is 32<br />

years. Both variables, time spent in Germany and age, depend linearly <strong>on</strong> time and are<br />

included in our regressi<strong>on</strong> as time varying covariates. Similar to Ham and Rea (1987),<br />

identificati<strong>on</strong> of the coefficients of time spent in Germany and age comes from variati<strong>on</strong>s<br />

in the parameter values at the end of the study period.<br />

Other pers<strong>on</strong>al characteristics which are included in the regressi<strong>on</strong>s are gender and the<br />

field of study. 43 % of the scholarship recipients are women. We created dummies for<br />

six different fields of study: agricultural sciences, technical sciences, medicine, EBP (eco-<br />

nomics, business and politics), law and German (German language or literature studies).<br />

For descriptive statistics c<strong>on</strong>cerning the fields of study see Table 3.8 in the Appendix.<br />

Even though we have informati<strong>on</strong> about the student’s family status we do not use family<br />

status variables in our regressi<strong>on</strong>. The family status might have changed over time but<br />

in our data there is no history of family status. Pers<strong>on</strong>al characteristics are recorded at<br />

<strong>on</strong>e point in time and updated <strong>on</strong>ly if the student informs the KAAD about a change in<br />

his or her status. Therefore we do not know when the student did marry or when he had<br />

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