Choose a function and inverse based on a text string
A character string, or a list of two functions, they should be each other's inverse. Names of the list are ignored.
choose.trans returns a named list with two elements "trans"
and "inv", both functions which are each other's inverse. This is intended
to be stored as an attribute
"Transform" with the resulting object
and used in plotting and reporting. All results will be on the transformed
scale. If the
tr argument to
choose.trans is a character
constant, the appropriate named list of two functions will be generated.
Possibilities are: "exp", "log", "logit", "pctlogit" (transforms percentages
by the logit), "sqrt", "sq" (square), "cll" (complementary log-minus-log),
"ll" (log-minus-log). If there is no match
NULL is returned, which
will correspond to no transformation.
Bendix Carstensen, Steno Diabetes Center, http://bendixcarstensen.com/.
choose.trans( "logit" )
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