[R] aggregate counting variable factors

[Rui Barradas]

In package reshape2

Hope this helps,

Rui Barradas

Em 17-09-2015 17:03, Frank Schwidom escreveu:
> Hi
>
> where can i find 'melt' and 'dcast' ?
>
> Regards
>
>
> On Thu, Sep 17, 2015 at 08:22:10AM +0000, PIKAL Petr wrote:
>> Hi
>>
>>> -----Original Message-----
>>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Kai Mx
>>> Sent: Wednesday, September 16, 2015 10:43 PM
>>> To: r-help mailing list
>>> Subject: [R] aggregate counting variable factors
>>>
>>> Hi everybody,
>>>
>>> >From a questionnaire, I have a dataset  like this one with some 40
>>> items:
>>>
>>> df1 <- data.frame(subject=c('user1','user2', 'user3', 'user4'),
>>> item1=c(0,1,2,5), item2=c(1,2,1,2), item3=c(2,3,4,0), item4=c(0,3,3,2),
>>> item5=c(5,5,5,5))
>>>
>>> Users can choose an answer from 0 to 5 for each item.
>>>
>>> Now I want to reshape the dataset to have the items in rows and the
>>> count
>>> of each of the result factors in columns:
>>>
>>> result <- data.frame (item=c("item1", "item2", "item3", "item4",
>>> "item5"),
>>> result0=c(1,0,1,1,0), result1=c(1,2,0,0,0), result2=c(1,2,1,1,0),
>>> result3=c(0,0,1,2,0), result4=c(0,0,1,0,0), result5=c(1,0,0,0,4))
>>>
>>> I have been fiddling around with melt/plyr, but haven't been able to
>>> figure
>>> it out. What's the most elegant way to do this (preferably without
>>> typing
>>> in all the item names).
>>
>> Perhaps,
>>
>> m<-melt(df1)
>> m$value<-paste("res",m$value, sep="")
>> dcast(m, variable~value)
>> Aggregation function missing: defaulting to length
>>    variable res0 res1 res2 res3 res4 res5
>> 1    item1    1    1    1    0    0    1
>> 2    item2    0    2    2    0    0    0
>> 3    item3    1    0    1    1    1    0
>> 4    item4    1    0    1    2    0    0
>> 5    item5    0    0    0    0    0    4
>>
>> Cheers
>> Petr
>>
>>
>>>
>>> Thanks so much!
>>>
>>> Best,
>>>
>>> Kai
>>>
>>>        [[alternative HTML version deleted]]
>>>
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>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>