group.CI

0th

Percentile

Group Confidence Interval

Calculates the confidence interval of grouped data

Keywords
multivariate
Usage
group.CI(x, data, ci = 0.95)
Arguments
x
an `aggregate` compatible formula
data
a data frame (or list) from which the variables in formula should be taken
ci
the confidence interval to be calculated
Value

A data frame consisting of one column for each grouping factor plus three columns for the upper bound, mean and lower bound of the confidence interval for each level of the grouping factor

Aliases
  • group.CI
Examples
require(latticeExtra)
with(group.CI(weight~feed,chickwts),
 segplot(feed~weight.lower+weight.upper,center=weight.mean)
)

require(Hmisc)
with(group.CI(Temp~Month,airquality),
 xYplot(Cbind(Temp.mean,Temp.lower,Temp.upper)~numericScale(Month),type="b",ylim=c(60,90))
)
Documentation reproduced from package Rmisc, version 1.5, License: GPL-3

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