r:general_statistics
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| r:general_statistics [2017/11/06 08:04] – [e.g.,] hkimscil | r:general_statistics [2019/10/11 07:53] – [Forming a Confidence Interval for a Mean] hkimscil | ||
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| Line 497: | Line 497: | ||
| ====== Forming a Confidence Interval for a Mean ====== | ====== Forming a Confidence Interval for a Mean ====== | ||
| - | < | + | < |
| + | > set.seed(1024) | ||
| + | > x <- rnorm(50, mean=100, sd=15) | ||
| + | > s <- sd(x) | ||
| > m <- mean(x) | > m <- mean(x) | ||
| > n <- length(x) | > n <- length(x) | ||
| Line 509: | Line 512: | ||
| > SE | > SE | ||
| [1] 2.458358 | [1] 2.458358 | ||
| - | > E <- qt(.975, df=n-1)*SE | + | ## qt fun: qt(prob, df) zscore 2점에 해당하는 점수는? |
| + | > qtv <- qt(.975, df=n-1) | ||
| + | > qtv | ||
| + | [1] | ||
| + | ## qtv는 2에 해당하는 95퍼센트 CL | ||
| + | ## 이 때의 CI는 | ||
| + | > E <- qtv*SE | ||
| > E | > E | ||
| [1] 4.940254 | [1] 4.940254 | ||
r/general_statistics.txt · Last modified: 2019/10/11 07:56 by hkimscil