% 百分等级计算器（由数据或人数）Percentile Rank Calculator (from Data or Counts)

使用说明与常见问题How-to & FAQ

「百分等级计算器（由数据或人数）」是什么？What is the Percentile Rank Calculator (from Data or Counts) tool?

算某个分数的百分等级 PR =（低于该分的人数 + 0.5 × 等于该分的人数）÷ 总人数 × 100；可以直接粘贴全部分数，也可以只填人数，同时给出“不高于该分”的百分比。本地处理。Percentile rank of a score: PR = (number below + 0.5 × number equal) ÷ total × 100. Paste all the scores or enter just the counts; the percentage at or below the score is shown too. Processed locally.

如何使用「百分等级计算器（由数据或人数）」？How do I use the Percentile Rank Calculator (from Data or Counts) tool?

在「百分等级计算器（由数据或人数）」中，填写「输入方式」、「所有分数（空格或逗号分隔）」、「要查的分数」、「低于该分的人数」、「等于该分的人数」等参数，结果会随输入实时计算并显示在下方。In the Percentile Rank Calculator (from Data or Counts): Fill in "Input", "All scores (spaces or commas)", "Score to rank", "Number below", "Number equal"; results are recalculated instantly as you type.

百分等级怎么算？How is the percentile rank worked out?

常用公式 PR =（低于该分的人数 + 0.5 × 等于该分的人数）÷ 总人数 × 100。并列的分数算一半，这样同分的人得到同一个百分等级。例如 5 个分数 10、20、30、40、50 中，30 的 PR =（2 + 0.5）÷ 5 × 100 = 50。The usual formula is PR = (number below + 0.5 × number equal) ÷ total × 100. Ties count half, so people with the same score get the same rank. Among 10, 20, 30, 40 and 50, the score 30 has PR = (2 + 0.5) ÷ 5 × 100 = 50.

百分等级和百分位数有什么不同？How is a percentile rank different from a percentile?

百分等级是“某个分数排在百分之多少”，结果是 0–100 的数；百分位数反过来，是“第 p 百分位对应哪个分数”。A percentile rank says where a score stands, as a number from 0 to 100; a percentile goes the other way and gives the score at a given percentage.

为什么有的地方结果不一样？Why do some sources give a different answer?

有些考试和软件只数“低于”的人数（不算并列），或者用“不高于”的人数。页面把这两个比例也列出来，方便对照。Some tests and programs count only the scores strictly below, or everything at or below. Both of those percentages are listed too so you can compare.

能举个计算实例吗？Can you show a worked example?

例如在「百分等级计算器（由数据或人数）」中填 输入方式 = 只填人数，低于该分的人数 = 80，等于该分的人数 = 0，总人数 = 100，结果区显示：百分等级 PR：80；低于该分：80 / 100（80%）；等于该分：0 / 100；不高于该分（≤）：80%；ℹ PR = (低于人数 + 0.5 × 等于人数) ÷ 总人数 × 100For example, entering Input = Enter counts, Number below = 80, Number equal = 0, Total number = 100 in the Percentile Rank Calculator (from Data or Counts) gives: Percentile rank PR: 80; Below: 80 / 100 (80%); Equal: 0 / 100; At or below (≤): 80%; ℹ PR = (below + 0.5 × equal) ÷ total × 100

哪些输入会被检查？Which inputs are validated?

「百分等级计算器（由数据或人数）」会检查这些输入——「要查的分数」：所选方式用到时必须填写；「低于该分的人数」、「等于该分的人数」、「总人数」：可留空；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Percentile Rank Calculator (from Data or Counts) checks its inputs — "Score to rank": required when the chosen option uses it; "Number below", "Number equal", "Total number": optional; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「百分等级计算器（由数据或人数）」的设置：「输入方式」可选 粘贴所有分数、只填人数（默认 粘贴所有分数）；「所有分数（空格或逗号分隔）」默认 55, 61, 67, 70, 70, 74…；「要查的分数」默认 74；「低于该分的人数」默认 80；「等于该分的人数」默认 0；「总人数」默认 100。每次生成结果都按当前设置处理。Settings in the Percentile Rank Calculator (from Data or Counts) — "Input": Paste all scores, Enter counts (default Paste all scores); "All scores (spaces or commas)" default 55, 61, 67, 70, 70, 74…; "Score to rank" default 74; "Number below" default 80; "Number equal" default 0; "Total number" default 100. The result always uses the current settings.

计算精度如何？How precise are the results?

「百分等级计算器（由数据或人数）」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Percentile Rank Calculator (from Data or Counts) uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.

「百分等级计算器（由数据或人数）」免费吗？需要注册吗？Is the Percentile Rank Calculator (from Data or Counts) free? Do I need an account?

「百分等级计算器（由数据或人数）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Percentile Rank Calculator (from Data or Counts) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.