# Data tables, change logs and calculators

> The tables, change logs and calculators behind Bookie Ledger comparisons: what each table holds, how to read it and which sources and dates it uses.

Source: https://bookieledger.com/data/
Updated: 2026-11-07

Bookie Ledger publishes its working tables so a reader can repeat any comparison. The central table is the matrix: every operator against every criterion, with a source and a check date in each cell. On 7 November 2026 no snapshot exists yet, so the tables show structure and the calculators show worked examples only.

## Which tables are published?

Each table comes with a CSV whose values match the visible table.

**Tables planned for the data section · Source: operator public pages and GRAI licence register · Status 7 November 2026**

| Table | Columns | Status |
|---|---|---|
| Matrix | Operator, licensee, licence number, 19 criteria, score, date | Could not be verified on 7 November 2026 |
| Safer-gambling controls | Operator, five controls, source URL, date | Could not be verified on 7 November 2026 |
| Deposit methods | Operator against eight methods, source URL, date | Could not be verified on 7 November 2026 |
| Withdrawal terms | Operator, minimum and maximum, stated time, fee, source URL, date | Could not be verified on 7 November 2026 |
| Market coverage | Operator against ten menu categories, date | Could not be verified on 7 November 2026 |
| Settlement rules | Operator, cash out, void, dead heat, Rule 4, rules edition date | Could not be verified on 7 November 2026 |
| Score sensitivity | Operator and place under four sets of weights | Could not be verified on 7 November 2026 |
| Inclusion log | Licensee, licence type, included or the reason it is not | Could not be verified on 7 November 2026 |

The licence under which the data may be reused has not been chosen by the owner.

**Bottom line:** eight tables, one CSV each, none filled until the register and operator pages are checked.

## How should you read a table?

A blank cell means the operator does not publish the item on its public pages that day. It does not mean the feature does not exist.

A cell marked “Could not be verified on 7 November 2026” means the page was unavailable from Ireland or sat behind a login. It scores 0 and is not described as a fault.

Dates are the day of the check. A figure past its check date is flagged on the page.

**Bottom line:** blank means not published on the day; it is not a finding on the service.

## What do the change logs record?

The change log records edits to published facts by version: field, previous value, new value, date and source. A page changes its modified date only after a real edit.

The terms change tracker compares two snapshots of one operator. With only one snapshot, it shows the message “No changes recorded between these snapshots.”

**Bottom line:** one snapshot means no changes recorded, and the tool says so.

## Which calculators are provided?

The calculators teach arithmetic. They do not place bets, and the numbers below are examples, not odds from any operator.

**Calculator formulas with one worked example each · All numbers are examples**

| Tool | Formula | Example |
|---|---|---|
| Expected value | EV = stake × (p × O − 1); break-even probability 1/O | Odds 3.00, p 40%, stake €10: EV €2.00, break-even 33.33% |
| Overround | Sum of 1/O for all outcomes, minus 1 | Odds 2.50, 3.20, 3.10: overround 3.51% |
| Bet slip | Accumulator return = stake × product of decimal odds | Odds 2.00, 3.00, 1.50, stake €10: combined 9.00, return €90.00 |
| Terms change tracker | Compares two versions of a recorded fact | One snapshot: no changes recorded |

Results are rounded to two decimals, half up. Each tool states that it does not place bets.

**Bottom line:** formulas are shown beside examples so the result can be checked by hand.

## How are the tables built?

Facts come from the GRAI register, operator public pages and the Irish Statute Book. Each fact is logged with its source, date and a snapshot hash before it appears in a table.

The score is recalculated from the same facts, and the weights are listed on the [ranking page](https://bookieledger.com/compare/best-betting-sites-ireland/). Re-checks follow the schedule per fact family: licence entries weekly, payments monthly, safer-gambling items every 90 days.

**Bottom line:** no figure appears in a table without a logged source.

## Where to go next

- [Compare](https://bookieledger.com/compare/): where the tables are put to use.
- [Check a licence](https://bookieledger.com/licence/): the register step behind the first columns.
- [Betting terms explained](https://bookieledger.com/terms/): the definitions the calculators rely on.

**Bottom line:** start from a ranking and follow its cells back to the data.