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 |