anchor.diff:  
   
   %% @doc Extracts and calculates the size_kr field from the load_data record
  --spec calc_size_kr(load_data()) -> unknown | float().
  +-spec calc_size_kr(unknown | load_data()) -> unknown | float().
  +calc_size_kr(unknown) -> unknown;
  +
   calc_size_kr(Data) when is_record(Data, load_data) ->
       AvgKR = get_current_estimate(avg_kr, Data),
       try
  
positive.code: web_debug_info(State) ->
      PreviousState = state_get(prev_state, State),
      PreviousData = prev_state_get(load_data, State),
      CurrentData = state_get(load_data, State),
      BestState = previous_or_current(State),
      Best = if BestState =:= State -> current_data;
  
negative.code: 
  
  %% @doc Extracts and calculates the standard deviation from the load_data record
  -spec calc_stddev(unknown | load_data()) -> unknown | float().
  calc_stddev(unknown) -> unknown;
  
  calc_stddev(Data) when is_record(Data, load_data) ->
      Avg = get_current_estimate(avg, Data),
      Avg2 = get_current_estimate(avg2, Data),
  