COSESAI

Kanban Cycle Time & Throughput Coach Field Guide: When Five Numbers Reveal Whether the Board Is Flowing or Stuck

By xiezixing 2026年10月17日

A field guide to the Kanban Cycle Time & Throughput Coach on Elysia Tools: lead/cycle percentiles, WIP aging, throughput buckets, CFD reading rules, and Little's Law as a consistency check.

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Correlation Analyzer Field Guide: When Three Correlation Methods on One CSV Return Three Different Stories

By xiezixing 2026年10月14日

Correlation analysis looks simple on the surface: paste a CSV, get a coefficient between -1…

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Coefficient of Variation Calculator Field Guide: When Standard Deviation Lies About Variability and Three CSV Columns Quietly Disagree on Spread

By xiezixing 2026年9月24日

Strong close-first lead. Standard deviation sounds like the most rigorous spread metric you can compute,…

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Contingency Table Chi-Square Fisher Exact Cramér V Tutor Field Guide: When Seven Decisions Decide Whether Your 2×2 Chi-Square Lands as a Defensible Statistic or a Story You Tell Yourself

By xiezixing 2026年9月17日

Five tests, one tutor, and a table that decides whether your chi-square is even legal. Walk the seven decisions, three traps, and four audit checks.

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Two Proportion Z Test Calculator Field Guide: When Five Counts In and Three Numbers Out Decide Whether Your A/B Test Won

By xiezixing 2026年9月16日

Two proportions, one verdict. Most A/B tests end in a tie-breaker — the variant with…

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Calendar Heatmap Generator Field Guide: When 365 Squares, Five Color Buckets, and One Date Threshold Decide Whether Your Yearly Activity Reads as a Real Streak or a Flat Wall

By xiezixing 2026年9月6日

A calendar heatmap is one of the densest visual instruments — 365 squares, 5 color buckets, 1 year of activity. Field guide to scale decisions, failure modes, and pre-ship checks.

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CSV / Excel Diff Tool Field Guide: When Row-Level Differences Deserve a PDF Report You Can Email

By xiezixing 2026年8月29日

The CSV-Excel diff problem is not "did the file change"; it is "which rows, which…

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Data Crosstab Generator Field Guide: When the Pivot Table Is Doing Six Things

By xiezixing 2026年8月21日

Three rows, three columns, one decision. A crosstab (or pivot table) collapses thousands of rows…

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CSV Data Grouper Field Guide: When the Group By Finally Talks Back

By xiezixing 2026年8月16日

Group by a column, pick an aggregator, and the CSV summary writes itself. When a…

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ANOVA Calculator Field Guide: One-Way ANOVA Without the Spreadsheet

By xiezixing 2026年8月12日

Run one-way ANOVA on multiple labeled groups, inspect sums of squares, F statistic, and p-value, and audit the per-group summary before you trust the headline number.