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W-03-N04 · Article guide

Probability and frequency: where intuition loses the scale

Identify what was counted or modelled first. Past proportion, next-case chance and the outcome’s value answer different questions.

Questions explored

Is twenty percent past rescheduling the exact next-case chance?

Not automatically. Applying the figure to current conditions needs suitable grounds; future probability may remain unestimated.

Why do labels not establish equal chances?

Groups can contain different possibilities. Six denotes one card, another number five; selection conditions must be specified separately.

Does zero observed cases mean impossibility?

Not without further grounds. Zero concerns the selected past set; a future assertion needs suitable conditions.

Key distinctions

The article distinguishes a past-set proportion, a future case’s probability and evaluation of an outcome. (Article authors; artificial data.)

At the start of ChapterIII Laplace qualifies equal-case counting by equal possibility. (Laplace. Philosophical Essay on Probabilities, selected II–III passages; F. W. Truscott/F. L. Emory, English1902 edition. Bounded calculation-conditions passage read.)

Hume VI.4 asks that other effects not be overlooked when considering varied previous outcomes. (Hume. Enquiry concerning Human Understanding, VI, §§1–4 and note10; Hume Texts Online English text. Philosophical probability/expectation discussion.)

In the artificial 1000-book set, 16 of 20 damaged books are marked, while 16 of 96 marked books are damaged; the proportions have different denominators. (Article authors; artificial data.)

Limits of interpretation

  • Cards, library, damaged books and all counts are invented and arithmetically checked; no actual process was measured. Sources consulted within specified English bounds without French/Hebrew collation. No universal contemporary psychology, monetary strategy or real-risk threshold offered.

Sources

  • A Philosophical Essay on Probabilities, selected chaptersII–III — Pierre Simon Laplace

    Actual header23–58 read including translators/sixth French edition/1902; continuous displayed147–186 selected argument read, including ratio/equal cases, unequal grouping of two coin throws, independent product and dependent conditional product. ChaptersII/III are not claimed completely read.

    Source use: UNKNOWN_FOR_SPECIFIC_FUTURE_PUBLICATION

  • Enquiry concerning Human Understanding, SectionVI — David Hume

    Actual entire displayed SectionVI1–4 read, plus note10, covering ignorance/cause, differently marked die, varied effects and transfer past-to-future; exact clause independently checked at displayed31.

    Source use: UNKNOWN_FOR_SPECIFIC_FUTURE_PUBLICATION

  • Ecclesiastes9:7–12, King James Version — Ecclesiastes, religious wisdom text

    Actual unchanged primary reading of displayed1–12 earlier for W09 reused;7–12 is the used bounded passage, including daily living/work and limits of desired outcomes. KJV heading observed.

    Source use: UNKNOWN_FOR_SPECIFIC_FUTURE_PUBLICATION