Math & Numbers

R-Squared Calculator

Calculate coefficient of determination R squared from actual and predicted values

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/r-squared-calculator' \
  -H 'Content-Type: application/json' \
  -d '{"actualValues":"2, 4, 5, 4, 5","predictedValues":"2.8, 3.4, 4, 4.6, 5.2","decimalPlaces":4}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/r-squared-calculator

Parameters

Name	Type	Required	Description
actualValues	textarea	No	—
predictedValues	textarea	No	—
decimalPlaces	number	No	—

Response format

JSON result

JSON

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-r-squared-calculator": {
      "name": "r-squared-calculator",
      "description": "Calculate coefficient of determination R squared from actual and predicted values",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=r-squared-calculator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "r-squared-calculator",
    "arguments": {
  "actualValues": "2, 4, 5, 4, 5",
  "predictedValues": "2.8, 3.4, 4, 4.6, 5.2",
  "decimalPlaces": 4
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

Browse tools Open tool

curl -X POST 'https://api.elysiatools.com/en/api/tools/r-squared-calculator' \ -H 'Content-Type: application/json' \ -d '{"actualValues":"2, 4, 5, 4, 5","predictedValues":"2.8, 3.4, 4, 4.6, 5.2","decimalPlaces":4}'

Name

Type

Required

Description

actualValues

textarea

—

predictedValues

textarea

—

decimalPlaces

number

—

{ "mcpServers": { "elysiatools-r-squared-calculator": { "name": "r-squared-calculator", "description": "Calculate coefficient of determination R squared from actual and predicted values", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=r-squared-calculator", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "r-squared-calculator", "arguments": { "actualValues": "2, 4, 5, 4, 5", "predictedValues": "2.8, 3.4, 4, 4.6, 5.2", "decimalPlaces": 4 } } }