
I apologize if you have already seen my question.  I am new to the mailing list and I did not get any responses the first time I posted my question.  However, I am not sure my post went through.  
 
Here is my situation:  
I have a spreadsheet with columns of fish species (text) and length (numbers).  In the fish species column I have 5 different fish.  I want R to calculate the mean length and standard error for each species. 
  
I tried using the stats functin with 
stats(fishdata, by=species) 
  
R told me it could not find function stats.  Is there a library I need to install to get stats to work? 
 
Mike 		 	   		  
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