io.github.theluckystrike/ab-test-sample-size-calculator-mcp

up checked 2026-11-11T01:38:37.862Z

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Publisher-provided title

A/B Test Sample Size Calculator MCP

Publisher-provided description

Exact A/B test sample size, duration, z-test, chi-square, Fisher-Freeman-Halton and peeking risk.

Summary by lookupd

Computes A/B test sample sizes, durations, significance and peeking risk, plus exact Fisher tests for contingency tables of conversion…

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http ab-test-sample-size-calculator https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp

Codex, remote (streamable-http)

codex mcp add ab-test-sample-size-calculator --url https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "ab-test-sample-size-calculator": {
      "url": "https://ab-test-sample-size-calculator-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (5 tools)

Publisher-provided text

• calculate_sample_size Exact sample size per variant for an A/B test on a conversion rate (two independent proportions): baseline rate, minimum detectable effect (relative or absolute
• estimate_test_duration How many days an A/B test must run: from a known sample size per variant, or from baseline rate and MDE (computed as in calculate_sample_size), plus daily visit
• test_ab_significance Is an A/B test result statistically significant? From visitors and conversions per group: two-proportion z-test (pooled), one or two-sided p-value, Wald confide
• fisher_exact_test Exact p-value for a contingency table of counts. 2x2: Fisher exact test (two-sided, greater or less, as R fisher.test). Larger r x c tables (for example 3 varia
• check_peeking_risk What peeking does to an A/B test: the real false positive rate if you check a fixed-horizon test K times and stop at the first p < alpha (for example about 14%

Details

• Version: 1.0.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 680 ms
• First indexed: 2026-11-02T03:17:21.607Z
• Last seen in registry: 2026-11-02T03:17:21.607Z
• Repository: https://github.com/theluckystrike/ab-test-sample-size-calculator-mcp
• Website: https://abwex.com/tools/sample-size-calculator.html

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