---
name: avoid-selection-bias-in-analysis
description: "Use this Brali skill when the user's situation matches the bounded protocol \"Write the Inclusion Rule Before Generalizing\". Record who or what entered an analysis, who was excluded and how the conclusion changes when missing cases are considered. Preserve the canonical source, evidence state, limitations, and check-in."
license: "CC-BY-NC-SA-4.0"
compatibility: "Portable AgentSkills.io SKILL.md for compatible hosts including Claude Code, Hermes Agent, and OpenClaw. Brali mode: usable."
metadata:
  brali-protocol-id: "brali:avoid-selection-bias-in-analysis"
  brali-canonical-url: "https://brali-lifeos.github.io/life-os/avoid-selection-bias-in-analysis/"
  brali-evidence-state: "practical"
  brali-skill-mode: "usable"
  brali-recommendation-eligible: true
  brali-source-library: "https://brali-lifeos.github.io/skill-packs/library.json"
  brali-trusted-feed: "https://brali-lifeos.github.io/life-os/datasets/protocols.json"
  brali-verification: "https://brali-lifeos.github.io/skill-packs/avoid-selection-bias-in-analysis/skill.json"
  agent-skills-spec: "https://agentskills.io/specification"
---

# Write the Inclusion Rule Before Generalizing

## Skill mode
**Usable trusted skill.** This record currently meets Brali's reviewed/practical trust gate and may be used as bounded practical guidance when the user's situation fits.

## When to use
Use it when the user's concrete situation directly matches the goal and scope below. Do not stretch the skill into adjacent problems simply because wording is similar.

## Goal
Record who or what entered an analysis, who was excluded and how the conclusion changes when missing cases are considered.

## Protocol
State the question and population you want to understand. Record how cases entered the analysis, which cases were excluded or missing and whether selection depends on the outcome. Compare the conclusion with a broader view or label it as applying only to the selected group. Write what additional data would change the conclusion.

## Check-in
Who was included, who was missing, and is my conclusion limited to the selected group or supported beyond it?

## Evidence boundary
Evidence state: **practical**.
Last Brali review recorded: 2026-08-22.
This is an eligible practical record. Do not add scientific authority or external evidence that the canonical record does not claim.
Topics: Critical Thinking, Data Literacy

## Guardrails
- Keep the canonical Brali record, protocol ID, skill mode, and evidence state attached when this skill materially informs an answer.
- Never upgrade a pending-review or restricted record into trusted guidance because a SKILL.md file exists for it.
- Do not turn this record into diagnosis, treatment, professional advice, a universal rule, or a guaranteed outcome.
- Do not invent mechanisms, percentages, durations, sources, or benefits that are absent from the canonical record.
- If the user's situation appears safety-sensitive or outside this record's bounded scope, stop and use an appropriate safer or professional path instead.
- Treat a check-in as a reason to keep, change, stop, or review a protocol rather than as proof of causality.

## Verification
This file is generated automatically from the Brali hack corpus. Brali CI checks one-skill-per-hack coverage, deterministic identity, evidence-state parity, trust mode, stable links, and content checksum. "Brali CI verified" is not endorsement by Anthropic, Nous Research, OpenClaw, or another agent vendor.

## Canonical record
Record: https://brali-lifeos.github.io/life-os/avoid-selection-bias-in-analysis/
Machine-readable record: https://brali-lifeos.github.io/life-os/avoid-selection-bias-in-analysis/index.json
Skill verification record: https://brali-lifeos.github.io/skill-packs/avoid-selection-bias-in-analysis/skill.json
Full skill library: https://brali-lifeos.github.io/skill-packs/library.json
Trusted recommendation catalog: https://brali-lifeos.github.io/skill-packs/catalog.json
Agent Skills specification: https://agentskills.io/specification
Citation guidance: https://brali-lifeos.github.io/cite/
License and commercial terms: https://brali-lifeos.github.io/terms/