summarySE
From Rmisc v1.5
by Ryan Hope
Summarizes data
Gives count, mean, standard deviation, standard error of the mean, and confidence interval (default 95%).
Usage
summarySE(data = NULL, measurevar, groupvars = NULL, na.rm = FALSE, conf.interval = 0.95, .drop = TRUE)
Arguments
 data
 a data frame
 measurevar
 the name of a column that contains the variable to be summariezed
 groupvars
 a vector containing names of columns that contain grouping variables
 na.rm
 a boolean that indicates whether to ignore NA's
 conf.interval
 the percent range of the confidence interval (default is 95%)
 .drop
 should combinations of variables that do not appear in the input data be preserved (FALSE) or dropped (TRUE, default)
Value

a data frame with count, mean, standard deviation, standard error of the mean, and confidence interval (default 95%).
References
http://www.cookbookr.com/Graphs/Plotting_means_and_error_bars_(ggplot2)
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