# Book Isle: Separate ranks, measurements and tie conventions

Language: en
Canonical: [Book Isle: Separate ranks, measurements and tie conventions](<https://allluckly.cn/en/guides/nasbook-ranking-ties-order-rules/>)
中文：[中文 HTML](<https://allluckly.cn/guides/nasbook-ranking-ties-order-rules/>)
English: [English HTML](<https://allluckly.cn/en/guides/nasbook-ranking-ties-order-rules/>)
Published: 2026-11-07T00:00:00+08:00
Modified: 2026-11-07T09:41:37+08:00
Author: Bison

Use a self-made score table to check tie conventions and distinguish rank gaps from measurement gaps.

English translation of the [Chinese original](<https://allluckly.cn/guides/nasbook-ranking-ties-order-rules/>), translated on 2026-11-07. Original publication dates, attribution, code and version notes are retained.

A ranking orders objects but does not necessarily show the size of measurement differences. The rank after a tie can also follow different conventions. Read the source table in Book Isle and keep headings, measurement, sorting direction and rank rule in external notes, using fictional game scores as a low-stakes example. This is not guidance for school, investment or real competition decisions, and assumes no automatic ranking calculation or tie-rule selection by the app.

## Start with a sample table containing measurements

Prepare four fictional teams A, B, C and D with scores nine, seven, seven and four, explicitly stating that higher scores rank earlier. In an external document, create a PDF or EPUB you can read normally, with headings for team, score and rank, and retain its source. Leave rank cells blank initially to practise different conventions; blank is not rank zero. For a published table, record book, edition, chapter, position and table number, retaining title, footnotes and population scope. Cropping only middle rows may lose the tie explanation. Complete scope matters more than the conspicuous first place.

## Record measurement definition and sorting direction

First identify the measurement, unit, period and group represented by the values. Higher score ranks earlier and lower time ranks earlier are different directions; magnitude alone does not supply one universal rule. If total score, average and rank all appear, record them separately rather than using totals to explain a ranking based on averages. If direction or definition is absent, mark it unspecified and inspect nearby prose and notes. Do not invent it if still missing. The practice example explicitly sorts nine, seven, seven and four descending; subsequent rank discussions rely on that premise.

## Distinguish row position from tied rank

Four teams occupying four rows do not require four distinct ranks one, two, three and four. Under competition ranking that skips positions after a tie, A is first, B and C second, and D fourth. B and C may exchange row order while remaining tied second. Keep row position and rank in separate columns so C in the third row does not become third place. If a secondary measure breaks ties, such as completed-item count, copy that rule and its values. Without an explicit secondary rule, do not separate equals by team-name order or personal preference.

## Compare tie conventions without mixing them

The same scores can use dense ranks one, two, two, three. In some statistical calculations, average ranks would be one, two point five, two point five and four. These are three conventions, not a claim that the book defaults to any of them. Label each result with its rule and purpose; do not use competition ranking for the first rows and dense ranking for the last. D’s score remains four in every version: its rank changes because the rule changes, not its performance. If the source supplies ranks without a tie convention, record the rule as unclear rather than replacing it with your favourite.

## Do not read rank differences as measurement differences

Return to the scores: A exceeds B by two, B and C differ by zero, and C exceeds D by three. Under competition ranking, A to B differs by one rank and C to D by two, but rank spacing is not an equal-interval score scale. With ranks alone, you cannot calculate a points lead or claim someone is several times better. Describe directly comparable measurements separately from ordinal positions. If a chart connects ranks, read its vertical-axis direction: first place may be at the top or bottom, so an upward line does not automatically indicate an increase in the underlying measurement.

## Check rounding and apparent ties

Two displayed sevens may be rounded from different precise values. Only an explanation or more precise data establishes whether they are genuinely tied. Equal display values do not prove a ranking error, and you must not invent hidden decimals to explain a difference. The practice scores are explicitly original integers, so B and C are truly equal, unlike the rounding case. Record decimal precision, notes and secondary sorting, distinguishing an explicit tie, equal displayed values with unclear rules and insufficient information. External calculation can use known data only; it cannot supply missing definitions.

## Check scope and filtering when ranks seem inconsistent

If prose says third while the table says fourth, first confirm period, group and rank convention. A top-only excerpt, excluded category or subgroup ranking can change scope, but requires source support rather than assumption. Revisit the title and footnotes and, if necessary, another complete table. Do not silently edit the source rank in your notes. For a wide table, use available viewing controls to inspect right-hand columns; a secondary measure may simply be off-screen. If unresolved, record a discrepancy pending review with both wordings and locations.

## Recompute one row after leaving and returning

Leave the reader and return to the four scores from the table title. Hide your rank results and recompute D’s place using the recorded rule. It is fourth under competition ranking and third under dense ranking; B and C each receive two point five under average ranks. If a result differs, check for mixed conventions first. The final summary should preserve measurement, direction, scope, tie convention and quantities that cannot be inferred, not just a sequence of ranks. Completion means explaining why a rank occurs and what it does not reveal about score gaps, rather than reranking real people or organizations.

## Related guides and sources

[Book Isle data tables: distinguish zero, blank, dash and unspecified values](<https://allluckly.cn/en/guides/nasbook-table-zero-blank-symbols/>); [Read statistical claims in Book Isle: restore denominators, time windows and source tables](<https://allluckly.cn/en/guides/nasbook-statistical-claim-denominator/>).

Checked on November 7, 2026: [Apple public version information](<https://itunes.apple.com/lookup?id=6766198898&country=cn>) lists Book Isle 1.1.4, requiring iOS / iPadOS 15.6 or later. Feature scope follows the [official App Store description](<https://apps.apple.com/cn/app/id6766198898>) and the installed version. This article provides reading and checking methods you can perform; it does not claim step-by-step physical-device or private-server testing. Manual records, external tools and actually visible controls are identified separately, and personal analysis or code observations are not presented as verified automatic capabilities.

Different tie conventions are described in [IBM: TIES subcommand](<https://www.ibm.com/docs/en/spss-statistics/31.0.0?topic=rank-ties-subcommand-command>). The scores and row-by-row checking workflow here are original exercises and require no statistics software.