Aggregate function: returns the average of the values in a group.
     
    
    Usage
    avg(x, ...)
# S4 method for class 'Column'
avg(x)
 
    
    Arguments
- x
- Column to compute on or a GroupedData object. 
- ...
- additional argument(s) when - xis a GroupedData object.
 
 
    
    
    
    Examples
    if (FALSE) avg(df$c) # \dontrun{}