Create a focal value vector.
This selects some values of a variable and creates a new "focal vector" from them. Can use one "divider" algorithm, to be selected by name.
focalVals(x, divider = "quantile", n = 3)
x |
The input variable may be numeric or a factor. |
divider |
Either a quoted string name of an algorithm or a function. Default = "quantile" for numeric variables, "table" for factors. Other valid values: "seq" for an evenly spaced sequence from minimum to maximum, "std.dev." for a sequence that has the mean at the center and values on either side that are proportional to the standard deviation. |
n |
Desired number of focal values. |
This is a "wrapper" (or convenience) function that re-directs work to other functions. The functions that do the work to select the focal values for types ("table", "quantile", "std.dev.", "seq") are (cutByTable(), cutByQuantile(), cutBySD(), and plotSeq())
The built-in R function pretty()
works as of rockchalk 1.7.2. Any function that accepts an argument
n will work, as long as it creates a vector of values.
A named vector of focal values selected from a variable. The values of the names should be informative and useful for plotting or other diagnostic work.
Paul E. Johnson <pauljohn@ku.edu>
predictOMatic newdata
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.