'arg'必须为NULL或字符向量

Question

Here's a prop.test function:

baby.prop.test = function (x, n, p, conf.level = 0.95) {
  # ...
  return(prop.test(x,n,p,conf.level))
  #baby.prop.test$statistic
}
# test case
baby.prop = baby.prop.test(72, 100, .7, conf.level=.99)
stopifnot(isTRUE(all.equal(as.numeric(baby.prop$statistic), .43643578)))
stopifnot(isTRUE(all.equal(as.numeric(baby.prop$p.value), .66252058)))

Here is the error:

Error in match.arg(alternative) : 
  'arg' must be NULL or a character vector

Any idea what's wrong?

Answer 1

According to formals(prop.test) or ?prop.test the fourth argument is called alternative and has to be a character of c("two.sided", "less", "greater") . Your fourth element is conf.level (which is the fifth of prop.test , the order matters). To "ignore" the order of arguments you have to name your arguments (at least the conf.level ):

prop.test(x, n, p, conf.level=conf.level)