b:head_first_statistics:variability_and_spread
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| b:head_first_statistics:variability_and_spread [2025/09/16 06:55] – [Variance] hkimscil | b:head_first_statistics:variability_and_spread [2025/09/17 08:12] (current) – [Standard score] hkimscil | ||
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| Line 140: | Line 140: | ||
| 10 * ( 125 / 100) = 12.5 | 10 * ( 125 / 100) = 12.5 | ||
| 이 숫자를 반올림하면 13이므로 13번째 숫자가 10번째 페센타일이 된다 (13). | 이 숫자를 반올림하면 13이므로 13번째 숫자가 10번째 페센타일이 된다 (13). | ||
| + | < | ||
| + | > k <- c(1:125) | ||
| + | > # x th percentile | ||
| + | > k[ceiling(10 * (125 / 100))] | ||
| + | [1] 13 | ||
| + | > k[ceiling(.1 * length(k))] | ||
| + | [1] 13 | ||
| + | > quantile(k, .1) | ||
| + | | ||
| + | 13.4 | ||
| + | > | ||
| + | > # 50% percentile | ||
| + | > k[ceiling(50*(length(k)/ | ||
| + | [1] 63 | ||
| + | > k[ceiling(.5*(length(k)))] | ||
| + | [1] 63 | ||
| + | > median(k) | ||
| + | [1] 63 | ||
| + | > quantile(k, .5) | ||
| + | 50% | ||
| + | | ||
| + | > | ||
| + | > | ||
| + | </ | ||
| + | |||
| < | < | ||
| Line 210: | Line 235: | ||
| [[:standard deviation]] | [[:standard deviation]] | ||
| ====== Standard score ====== | ====== Standard score ====== | ||
| + | see | ||
| [[:standard score]] | [[:standard score]] | ||
| + | [[:z score]] | ||
| $ z = \large\frac {x-\mu}{\sigma} $ | $ z = \large\frac {x-\mu}{\sigma} $ | ||
b/head_first_statistics/variability_and_spread.1757973307.txt.gz · Last modified: by hkimscil