Anova Oneway

{
  "asOf": "2026-10-11T08:55:54.742Z",
  "degraded": false,
  "dfBetween": 2,
  "dfWithin": 15,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "etaSquared": 0.55263158,
  "fStatistic": 9.264705882,
  "grandMean": 8,
  "groupMeans": [
    5,
    9
  ],
  "groupSizes": [
    6,
    6
  ],
  "groups": 3,
  "maxVarianceRatio": 1.75,
  "meanSquareBetween": 42,
  "meanSquareWithin": 4.533333333,
  "notChecked": [
    "assumptions: independent groups, roughly normal residuals and similar variances (a variance ratio warning is given)",
    "which groups differ (a significant F does not say; follow up with corrected pairwise tests)",
    "…1 more"
  ],
  "omegaSquared": 0.47870528,
  "pValue": 0.0023987773,
  "reasons": [
    "Group variances are similar enough.",
    "Effect size bands for eta squared: 0.01 small, 0.06 medium, 0.14 large.",
    "…1 more"
  ],
  "significantAt5pct": true,
  "source": "computed locally",
  "sumSquaresBetween": 84,
  "sumSquaresWithin": 68,
  "summary": "F(2, 15) = 9.2647, p = 0.002399; eta squared 0.553 (large effect). At least one group mean differs.",
  "totalObservations": 18,
  "verdict": "SIGNIFICANT"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://stats-tests.x402tookit.com/anova-oneway?groups=6%2C8%2C4%2C5%2C3%2C4%3B8%2C12%2C9%2C11%2C6%2C8%3B13%2C9%2C11%2C8%2C7%2C12'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://stats-tests.x402tookit.com/anova-oneway?groups=6%2C8%2C4%2C5%2C3%2C4%3B8%2C12%2C9%2C11%2C6%2C8%3B13%2C9%2C11%2C8%2C7%2C12' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fstats-tests.x402tookit.com%2Fanova-oneway
const res = await pay("https://stats-tests.x402tookit.com/anova-oneway?groups=6%2C8%2C4%2C5%2C3%2C4%3B8%2C12%2C9%2C11%2C6%2C8%3B13%2C9%2C11%2C8%2C7%2C12");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://stats-tests.x402tookit.com/anova-oneway?groups=6%2C8%2C4%2C5%2C3%2C4%3B8%2C12%2C9%2C11%2C6%2C8%3B13%2C9%2C11%2C8%2C7%2C12")
    print(res.status_code, res.text)