Description Usage Arguments Details Value Note Author(s) Examples
This function will calculate the median and interquartile range of a distribution, possibly for each level of a grouping variable.
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x |
The numeric vector to summarize. |
formula |
A formula with the numeric vector on the left hand side and one or more grouping variables/factors on the right hand side. |
data |
A |
subset |
An optional vector specifying a subset of observations to be used for the calculations. |
overall |
If |
overall.label |
If |
na.rm |
A logical value indicating whether |
na.action |
A function which indicates what should happen when the data contain
|
... |
Arguments passed to |
For the formula method, multiple variables on the right hand side
of the formula are combined to form the unique levels by which
the numeric vector is summarized. The underlying code is borrowed
from boxplot
so whatever works there will work here.
An intercept-only model does not work currently but that would be useful.
The ... argument can be used to specify which of nine quantile algorithms is used.
The default method returns a numeric vector of length 3 showing the median, Q1, and Q3.
The formula method returns a numeric matrix with rows reprsenting the median, Q1, and Q3 and columns representing the factor levels.
For both methods, the result is of class "medIQR"
but
it will probably change to to class "sumry"
or something
similar so that functions like meanSD
return
an object of the same class.
We use the term “interquartile range” to be the lower and upper
quartile rather than their difference as is returned by IQR
.
Stephen Weigand Weigand.Stephen@mayo.edu
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