Function for Data Transformations
Transformations of Response or Input Variables
ptrafo(data, numeric_trafo = id_trafo, factor_trafo = ff_trafo,
ordered_trafo = of_trafo, surv_trafo = logrank_trafo,
var_trafo = NULL)
ff_trafo(x)data |
an object of class |
numeric_trafo |
a function to by applied to |
ordered_trafo |
a function to by applied to |
factor_trafo |
a function to by applied to |
surv_trafo |
a function to by applied to
elements of class |
var_trafo |
an optional named list of functions to be applied to the
corresponding variables in |
x |
a factor |
trafo applies its arguments to the elements of data
according to the classes of the elements. See Transformations
for more documentation and examples.
In the presence of missing values, one needs to make sure that all user-supplied functions deal with that.
A named matrix with nrow(data) rows and
arbitrary number of columns.
### rank a variable
ptrafo(data.frame(y = 1:20),
numeric_trafo = function(x) rank(x, na.last = "keep"))
### dummy coding of a factor
ptrafo(data.frame(y = gl(3, 9)))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.