Group Upper-Center-Lower
Applies a function which calculates a parameter with lower/uper bounds to groups of data.
group.UCL(x, data, FUN, ...)
x |
an 'aggregate' compatible formula |
data |
a data frame (or list) from which the variables in formula should be taken. |
FUN |
the function to apply to each group |
... |
extra params passed on to aggregate |
A data frame consisting of one column for each grouping factor plus three columns for the upper bound, mean and lower bound of the standard error interval for each level of the grouping factor.
require(latticeExtra) with(group.UCL(weight~feed,chickwts,FUN=CI), segplot(feed~weight.lower+weight.upper,center=weight.mean) ) require(Hmisc) with(group.UCL(Temp~Month,airquality,FUN=STDERR), xYplot(Cbind(Temp.mean,Temp.lower,Temp.upper)~numericScale(Month),type="b",ylim=c(60,90)) )
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