endword110的博客

dnorm(x, mean = 0, sd = 1, log = FALSE)pnorm(q, mean = 0, sd = 1, lower.tail = TRUE, log.p = FALSE)qnorm(p, mean = 0, sd = 1, lower.tail = TRUE, log.p = FALSE)rnorm(n, mean = 0, sd = 1)//-----

Introduction to Bayes using Discrete PriorsJim AlbertMay 28, 2014Learning About a ProportionA Discrete PriorConsider a population of “successes” and “failures” where the proportion of suc-cesses is p....

> attach(mtcars)> tapply(mpg,cyl,mean)       4        6        8 26.66364 19.74286 15.10000 由：> table(cyl)cyl 4  6  8 11  7 14 可以看出，tapple是以mpg按cyl来应用mean函数具体> mean(mpg[cyl==4])[1] 26.6636...