[R] using aggregate with survey-design and survey functions

[Spencer Graves]

What do you get from the following: 

      is.element("income", objects())

spencer graves

TyagiAnupam at aol.com wrote:

>Hi R users,
>
>I am trying to use the aggregate function with a survey design object and 
>survey functions, but get the following error. I think I am incorrectly using the 
>syntax somehow, and it may not be possible to access variables directly by 
>name in a survey-design object. Am I right? How do I fix this problem? I have 
>used aggregate with "mean" and "weighted.mean", and that works fine. I am trying 
>to find out where the difference is. What would be an efficient alternative 
>to aggregate for a large dataset?
>
>  
>
>>s <- aggregate(income,list(age,sex),function(x) (svymean(~x,design=d.na)))
>>    
>>
>Error in aggregate(income, list(age, sex), function(x) (svymean(~x,  : 
>    Object "income" not found
> 
>
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