# [racket] Plot, fit

I can't figure out how to use the function called fit, provided by the plot collection.
(fit f guess-list data) → fit-result?
f : (real? ... . -> . real?)
guess-list : (list/c (list symbol? real?))
data : (or/c (list-of (vector/c real? real? real?))
(list-of (vector/c real? real? real? real?)))
Are the first arguments to f the independent variables?
Are the symbols in the guess-list the names of the independent variables as defined in f?
How is the data arranged in each list-of vectors?
rac