我是 R 的新用户,想用 std
制作折线图使用 ggplot
.
为此,我使用 summarySE
功能。
vrn1_summary<-summarySE(data,measurevar = "vrn1",groupvars = c("genotype","treatment","time"))
由于我无法创建自己的函数,因此我从 R Cookbook 中复制如下:
summarySE <- function(data=NULL, measurevar, groupvars=NULL, na.rm=FALSE,
conf.interval=.95, .drop=TRUE) {
library(plyr)
# New version of length which can handle NA's: if na.rm==T, don't count them
length2 <- function (x, na.rm=FALSE) {
if (na.rm) sum(!is.na(x))
else length(x)
}
# This does the summary. For each group's data frame, return a vector with
# N, mean, and sd
datac <- ddply(data, groupvars, .drop=.drop,
.fun = function(xx, col) {
c(N = length2(xx[[col]], na.rm=na.rm),
mean = mean (xx[[col]], na.rm=na.rm),
sd = sd (xx[[col]], na.rm=na.rm)
)
},
measurevar
)
# Rename the "mean" column
datac <- rename(datac, c("mean" = measurevar))
datac$se <- datac$sd / sqrt(datac$N) # Calculate standard error of the mean
# Confidence interval multiplier for standard error
# Calculate t-statistic for confidence interval:
# e.g., if conf.interval is .95, use .975 (above/below), and use df=N-1
ciMult <- qt(conf.interval/2 + .5, datac$N-1)
datac$ci <- datac$se * ciMult
return(datac)
}
当我调用这个函数时,它给出
sd
(标准偏差),se
(标准错误)和 ci
(置信区间),但显示 NA
为 mean
,在我的数据中是“vrn1”,也显示警告。据我了解,这可能是
summarySE
中的问题。功能,但我无法找出在哪里/为什么。谁能帮我解决这个问题。或者指导我如何写一个简单的
summarySE
功能?
最佳答案
请检查您的数据
str(data)
我猜你的measurevar vrn1 是 Chrome .
关于r - 如何在 R 中编写 summarySE 函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30485154/