If the input is XLSX, sheets named "key" and "varlab" are imported if the exist. If input is CSV, then the key CSV file is imported and another file suffixed with "-varlab" is imported if it exists.
keyRead(file, ..., na.strings = c("\\s+"))
A data frame or matrix.
name of file to be imported, including path to file. file name must end in "csv", "xlsx" or "rds"
additional arguments for read.csv or read.xlsx.
Values to be converted to R missing symbol NA. Default is white space, "\s+".
Paul Johnson <pauljohn@ku.edu>
The variable lables are a named vector saved as an attribute of the key object.