> ## Documentation Index
> Fetch the complete documentation index at: https://docs.effectiveai.app/llms.txt
> Use this file to discover all available pages before exploring further.

# relativities.ppa

> Every public name in relativities.ppa, from its docstrings.

*Generated from the package's Python API.*

Personal auto: the line's schema.

`SCHEMA` lists the tables of a PPA book, their keys and their core columns:
facts with one meaning each, typed and empty unless supplied. Every other
column is yours. `relativities.Book(tables, schema=ppa.SCHEMA)` is a PPA
book, a `relativities.Study` builds versions of it for what-if analysis, and
a `relativities.Program` rates it with one carrier's rater: its `prepare` turns
the book into that rater's input.

## SCHEMA

```python theme={null}
SCHEMA: Schema
```

The personal auto line's schema: households, submissions, drivers, vehicles, incidents and coverages, with their keys and core columns. Pass it as `Book(tables, schema=ppa.SCHEMA)`. `print(ppa.SCHEMA)` lists every column, and the [PPA book schema](/relativities/reference/book-schema) page shows the same tables.


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