Errata: Two Pools
The idea: a total can say the opposite of every group inside it when the groups are mixed differently; compare like with like before you rank.
Read it
Who is in this book
- Opal A measure is a stand-in for something fuzzy; ask what it was standing in for from InquiryForge
- Danya a child of the Green Asks "how do we know?"
- Deed Go to the original document, not a summary of a summary from NewsForge
- Prei Of everything that got flagged, how much was really what you feared from FilterForge
- Widen One number means little without something to compare it with from NewsForge
- Attest Every claim names its source, and a correction names one too from NewsForge
- Tara a child of the Green Listens longest, speaks last
Every recurring character has a short tune, so you can tell who is on stage before a word is said. The tunes play only when you tap, and the Reading Access sound switch turns them off.
The Honest Page
Which parts of this story are true, stretched or made up?
True
- Simpson's paradox is when a trend that appears in every group of data disappears or reverses when the groups are added together, usually because the groups are of very different sizes in the things being compared. Source
- A well-known medical study compared two treatments for kidney stones. One treatment did better for small stones and for large stones, yet worse overall, because it had been used much more often on the harder, large-stone cases. Source
- In the case, Riverside passed 50% of its beginners and 90% of its improvers, 60% overall; Hillside passed 40% of its beginners and 80% of its improvers, 70% overall.
Stretched
- In the case, every swimmer is neatly either a beginner or an improver. What we simplified: Real clubs have swimmers of every level, and how good a club is depends on much more than one badge. Splitting into two groups shows the idea; a fair comparison might need more groups, and more than one measure.
Made up
- The two swimming clubs, their badge records, the summer special, Sam, Mr Grant, Ms Osei and Mrs Lin are made up. Simpson's paradox is real.
Tara’s sentence
The case stops where Tara speaks. Write the sentence you would have said. It stays on this device.
Kept.
Your sentence lives on this device. Nothing is sent anywhere.
Ring the hammer for someone
Pick this book for someone younger. The link carries only the book, and it will wait for them on the Green.