Table 3 Comparison of gross sample, refusals and realized sample in wave 1
From: The IZA evaluation dataset survey: a scientific use file
Gross | Wave 1 | p-value | |||
|---|---|---|---|---|---|
Sample | Refusals | Realized sample | |||
(1) | (2) | (3) | (1) vs. (3) | (2) vs. (3) | |
Number of observations | 81,391 | 5,388 | 17,396 | ||
Female | 43.9 | 44.5 | 47.4 | 0.000 | 0.000 |
Age category | |||||
≤ 24 years | 28.0 | 28.0 | 27.6 | 0.263 | 0.581 |
25 to 34 years | 26.6 | 25.7 | 26.1 | 0.114 | 0.631 |
35 to 44 years | 24.6 | 25.7 | 25.1 | 0.308 | 0.281 |
≥ 45 years | 20.7 | 20.5 | 21.3 | 0.061 | 0.217 |
German citizen | 91.1 | 92.6 | 92.7 | 0.000 | 0.001 |
School degree | |||||
None, unknown | 8.0 | 6.6 | 5.4 | 0.000 | 0.001 |
Lower secondary school | 34.7 | 35.2 | 30.5 | 0.000 | 0.000 |
Middle secondary school | 36.5 | 37.3 | 37.6 | 0.007 | 0.666 |
Advanced middle sec. school | 7.6 | 8.0 | 9.3 | 0.000 | 0.003 |
Upper secondary school (A-level) | 13.2 | 12.9 | 17.1 | 0.000 | 0.000 |