Convert left/right variables to a measure of asymmetry
     
    
    mapAsymVar(
  mydataframe,
  leftvar,
  leftname = "left",
  rightname = "right",
  replacer = "Asym"
)
 
    
    Arguments
- mydataframe
- dataframe containing relevant variables 
- leftvar
- left side variable names ie the full names of the variables to asym 
- leftname
- the variable substring indicating left side 
- rightname
- the variable substring indicating right side 
- replacer
- string to replace left with in column names of output