Luke Fostveldt, Alex Shum, Ian Lyttle, Di Cook

9/17/2014

OECD PISA is *the world's global metric for quality, equity and efficiency in school education* assesses the workforce readiness of 15-year old students.

There are 485490 students tested, from 64 different countries. Only 162 schools in the USA are measured, but 885 are measured in Canada, and 1471 in Mexico.

```
[1] 485490
```

```
[1] 64
```

```
[1] 162
```

```
[1] 885
```

```
[1] 1471
```

Four tables of information:

- student: Pupil performance in mathematics, reading and science is coded by five plausible values
- school: Questionnaire completed by school principals
- parent: Parents were asked to fill in a questionnaire
- scoreditem: stuff

Details of the data, competition tracks, and entries are at

- Compute the sample-weighted mean math score for girls/boys separately for each country.
- Calculate difference in the means (boy - girl)
- Compute ratio boys to girls taking the test
- Do t-test separately by country, record unadjusted p-values
- Sort countries from biggest difference to least, biggest gender gap in favor of boys to that in favor of girls
- Plot difference by country, colored by significance, sized by proportion