An IERI – International Educational Research Institute Journal
Table 2 Description of the different variables
From: Multiple imputation using chained equations for missing data in TIMSS: a case study
Variable | Type of variable | Description |
|---|---|---|
Age | Continuous | |
Number of books (Books) | Ordinal | Five categories: |
1 Less than one shelf | ||
2 One shelf | ||
3 One bookcase | ||
4 Two bookcases | ||
5 Three or more bookcases | ||
Possessing calculator (Calculator) | Binary | Two categories: |
1 Yes | ||
0 Otherwise | ||
Possessing computer (Computer) | Binary | Two categories: |
1 Yes | ||
0 Otherwise | ||
Possessing study desk (Desk) | Binary | Two categories: |
1 Yes | ||
0 Otherwise | ||
Possessing a dictionary (Dictionary) | Binary | Two categories: |
1 Yes | ||
0 Otherwise | ||
Possessing internet connection (Internet_connection) | Binary | 2 Two categories: |
1 Yes | ||
0 Otherwise | ||
Parents’ highest education level (Parents’_highest_ed_level) | Ordinal | Five categories: |
1 University degree | ||
2 Completed postsecondary but not university | ||
3 Completed upper-secondary education | ||
4 Completed lower-secondary education | ||
5 Less than lower-secondary education | ||
Parents born in country (Parents_born_country) | Nominal | Three categories: |
1 Both parents born in country | ||
2 Only one parent born in country | ||
3 Neither parent born in country | ||
Gender of student (Female) | Binary | Two categories: |
1 Female | ||
0 Male | ||
Spend time work on paid jobs (Work_paid_job) | Ordinal | Five categories: |
1 No time | ||
2 Less than one hour | ||
3 One to two hours | ||
4 More than two hours but less than four/ | ||
5 Four or more hours | ||
Index of availability of mathematics resources (Index_math_ress) | Ordinal | Three categories: |
1 High | ||
2 Medium | ||
3 Low | ||
First plausible value in mathematics (BSMMAT01) | Continuous | |
First plausible value in science (BSSSCI01) | Continuous |