brkdn {prettyR} | R Documentation |
Calculates means, variances and ns for subgroups of numeric observations and displays the results.
brkdn(formula,dataframe,maxlevels=10,do.sd=FALSE)
formula |
a formula with the variable to be broken down on the left and the names of one or more variables defining subgroups on the right |
dataframe |
the data frame from which to select the variables |
maxlevels |
the maximum number of levels in any subgroup |
do.sd |
logical - whether to return standard deviations instead of variances |
brkdn
will accept a formula referring to columns in a data frame.
It calls dstats
for the calculations and displays a table of results.
The results of dstats
, or a multi-level list if more than
one grouping variable is specified.
Jim Lemon
test.df<-data.frame(Age=rnorm(100)+3*10,Sex=sample(c("M","F"),100,TRUE), Employ=sample(c("FT","PT","NO"),100,TRUE)) brkdn(Age~Sex+Employ,test.df)