# Contingency Table Calculator API

> For the complete documentation index, see [llms.txt](/llms.txt).

Chi-square test of independence for an r x c contingency table with expected counts, standardized residuals, cell contributions, and Cramer's V.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `contingency-table-calculator`
- Category: `math`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 262144 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/contingency-table-calculator/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/contingency-table-calculator/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `table` | `str` | no | observed counts, one row per line, values separated by commas or spaces |
| `row_labels` | `str` | no | optional comma-separated row labels |
| `column_labels` | `str` | no | optional comma-separated column labels |
| `yates_correction` | `str` | no | auto | yes | no Choices: auto, yes, no |
| `alpha` | `str` | no | 0.05 | 0.01 | 0.10 Choices: 0.05, 0.01, 0.10 |
| `precision` | `int` | no | decimal places, 2-10 |

## Example request

```json
{
  "table": "20, 30, 25\n15, 40, 20",
  "alpha": "0.05"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/contingency-table-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"table":"20, 30, 25\n15, 40, 20","alpha":"0.05"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "contingency-table-calculator",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the Contingency Table Calculator API do?

Chi-square test of independence for an r x c contingency table with expected counts, standardized residuals, cell contributions, and Cramer's V. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: (none). Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.