Internal function to recode numeric CNA alteration values to factor values
     
    
    Usage
    recode_cna(alteration_vector)
 
    
    Arguments
- alteration_vector
- a vector of CNA alterations coded with any of the
following levels: neutral, deletion, amplification, gain, loss, homozygous deletion,
hemizygous deletion, loh, gain, high level amplification, 0, -1, -1.5, -2, 1, 2. 
 
    
    Value
    a recoded CNA data set with factor alteration values. See details for code dictionary
     
    
    Details
    CNA is coded to the following key based on key: values below
- "neutral":  "0", "neutral", 
- "deletion": "homozygous deletion", "-2", 
- "deletion": "loh", "-1.5", 
- "deletion": "hemizygous deletion", "-1", 
- "amplification": "gain", "1", 
- "amplification": high level amplification", "2", 
 
    
    Examples
    recode_cna(blca_cna$alteration[1:10])
#>  [1] amplification deletion      amplification deletion      deletion     
#>  [6] deletion      deletion      deletion      amplification amplification
#> Levels: deletion amplification