preprocess: Data preprocessing
In BoyaoZhang/data516: Data 516 Workstudio

Data preprocessing for factor, numeric, character and missing values.

1 2	preprocess(data, factor = NULL, numeric = NULL, character = NULL, omit.missing = FALSE)

`data`	[`character(1)`] Give the data set to be preprocessing.
`factor`	[`factor(1)`] A vector of variable names which should be as factor. Default is `NULL`.
`numeric`	[`factor(1)`] A vector of variable names which should be as numeric. Default is `NULL`.
`character`	[`factor(1)`] A vector of variable names which should be as character. Default is `NULL`.
`omit.missing`	[`logical(1)`] Omit the missings values? Default is `FALSE`.