r - sum(.) on a factor column returns incorrect result -


I'm here in a strange fix. I very am using data.table for routine tasks, but something that would not be able to convince me. I figured out a way around the problem, but I think it is still important to understand that for me what's wrong.

This code data will bring the workspace: 

  library (XML) library (data Dtebl) Thurl & lt; - "http://goo.gl/hOKW3a" table & lt; - HTMLTable (Theral) New L & lt; - Datataybl (Table [[2] [4: 5] [- (1: 2)]) Dpres office (name (new. Ars) & lt; - c ( "Party", "case"))   
 There are two columns,  party  and  case . Both of which have the default class of  factor  However,  case  should be  numeric . Lastly, I just want the amount of  party  for each  party . Then something like this should be done:  
  new.Res [, zodiac (case), = by party]   
 but this does not give correct answer. I thought that if I change the class from  case  to  factor  to  numeric , then it will work. So I tried the following:  
  new.Res [, case: = as.numeric (case)] new.Res [, sum (case), = by party]   
 But I got the same wrong answer. I realized that the problem  case  and  Factor  and  is to change numeric  class, so I tried a different way and it works Done:  
 Step 1: Resume the data:  
  theurl & lt; - "http://goo.gl/hOKW3a" tables & lt; - Read the new HTML Tutorial (Theral). L & lt; - data that tables ([[2]] [4: 5] [- (1: 2)]) Dpres office (name (Nyakres) & lt; - c ( "Party", "case")) < / code>  
 Step 2: Use a different method to change the  numerical  class from factor :  
  New.Res [, Case: = Straw (case)] New LS [amount (case) = Party]   
 It works fine! However, I'm not sure what is wrong with the first two ways  factor    
 
 
 code> numerical  or  integer  is to go through the  character . This is because internally, a factor is an integer index (which is  class  refers to the vector). When you ask R to convert it to  numeric , it will only convert the underlying index, try not to change the level label.  
 Answer: Do  case: as .numeric (as.character (case)) .  
  Edit:  Alternatively ? Factor  Help page suggests more efficient as  as.numeric (level (case)) [case] . In comments H / T @ GC

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