Create a resampled permutation of a data frame
     
    
    Usage
    resample_permutation(data, columns, idx = NULL)
 
    
    Arguments
    - data
- A data frame 
- columns
- Columns to be permuted 
- idx
- Indices to permute by. If not given, generates them randomly 
 
    
    Value
    
A permutation object; use as.data.frame to convert to a permuted
data frame