group.CI
From Rmisc v1.5
by Ryan Hope
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
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))
)
Community examples
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