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GET /v1/correlation

Pearson correlation

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/statistics-api

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Code snippets

curl "https://api.oanor.com/statistics-api/v1/correlation" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/statistics-api/v1/correlation", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/statistics-api/v1/correlation");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/statistics-api/v1/correlation",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Pearson r = Σ(x−x̄)(y−ȳ) / √(Σ(x−x̄)²·Σ(y−ȳ)²), ranging from −1 (perfect inverse) to +1 (perfect direct).",
        "inputs": {
            "count": 5
        },
        "pearson_r": 0.774597,
        "r_squared": 0.6,
        "covariance_sample": 1.5,
        "covariance_population": 1.2
    },
    "meta": {
        "timestamp": "2026-06-04T18:38:14.865Z",
        "request_id": "f9b0d955-cf09-4362-9e70-5e7eba06e272"
    },
    "status": "ok",
    "message": "Pearson correlation",
    "success": true
}