This function validates the n_boats column in the provided dataset.
An alert (error label) is triggered if the number of boats is an outlier,
determined by the alert_outlier function with specified parameters. The alert number
is stored in alert_n_boats. If an alert is triggered, the n_boats value
is set to NA.
     
    
    Usage
    validate_nboats(data = NULL, k = NULL, flag_value = NULL)
 
     
    
    Arguments
- data
 
A data frame containing the n_boats column.
 
- k
 
a numeric value used in the LocScaleB function for outlier detection.
 
- flag_value
 
A numeric value to use as the flag for catches exceeding the upper bound.
 
 
    
    Value
    A data frame with two columns: n_boats and alert_n_boats.
n_boats: The original number of boats if valid, otherwise NA.
 
alert_n_boats: A numeric value indicating the alert (error label) number.
 
 
    
    Examples
    if (FALSE) { # \dontrun{
validate_nboats(data, k = 2, flag_value = 3)
} # }