Thanks for your help! I wasn't sure what the margins variable did, but I'm
beginning to understand. I'm almost there, but with my data (and with ff_d)
I tried to margin over two variable names, however it only does one of them.
So with ff_d I set margins=c("treatment","variable"); however I only ever
get 1_(all) 2_(all) and 3_(all)... never something like (all)_painty. (This
also happens for margins=TRUE)
To further exemplify, with my data I have the call to cast() as:
cast(data.melted,Subject~CogStat+Animacy,mean,margins=c("CogStat","Animacy"))
which results in:
Subject COG_a COG_i COG_(all) nCOG_a nCOG_i nCOG_(all)
1 100 794.3333 676.5556 728.0833 810.7778 798.4103 800.7292
...
I would like additionally to get (all)_i (all)_a. It seems to just apply the
margin to the first part of the formula before "+" (i.e. I can change it to
Animacy+CogStat and get a_COG, a_nCOG, a_(all), etc.)
hadley wrote:
>
> On Tue, May 5, 2009 at 3:03 PM, jwg20 <jason.gulli...@gmail.com> wrote:
>>
>> I have a data set that I'm trying to melt and cast in a specific way
>> using
>> the reshape package. (I'll use the ff_d dataset from reshape so I don't
>> have
>> to post a toy data set here. )
>>
>> Lets say I'm looking for the interaction of treatment with each type of
>> "variable" in ff_d. Using the command below gets me this. Subject will
>> get a
>> column and each treatment type by each variable will also get a column
>> with
>> values for each.
>>
>> cast(ff_d, subject~treatment+variable)
>> subject 1_potato 1_buttery 1_grassy 1_rancid 1_painty 2_potato
>> 2_buttery
>> .... 3_painty
>> 1 3 18 18 18 18 18 18
>> 18
>> .... 18
>> ...
>>
>> Now, if I want to look at just the the values for each variable by
>> subject
>> I can run the following command.
>> cast(ff_d, subject~variable)
>> subject potato buttery grassy rancid painty
>> 1 3 54 54 54 54 54
>> ...
>>
>> What I'm wondering now, is run one cast() call and get both of these in
>> one
>> data.frame? Essentially, the values for each separate "condition" and
>> interactions between them? cast() doesn't let me repeat variable names as
>> that's what I first tried. Right now, i'm just running two separate
>> cast()
>> calls and cbinding/merging them together. Is there a better way?
>
> Have a look at the margins argument.
>
> Hadley
>
>
> --
> http://had.co.nz/
>
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