[Rsiena-help] selecting certain actors

[Maarten Van Zalk]

Dear ruth,

to clarify your response on changing to 0: do you mean that by making  
the other actor's scores zero, Siena will exclude them (I assume not)?  
what does 'net' refer to?

On excluding other actors:

I do not understand what the command "net <- na.omit(net)" does; does  
it excludes all 0's?? or all missings? Is it after the first command  
(net[!net %in% c(1,2,3,4)] <- 0) you use this in order to make all 0's  
missing?

Kind regards,

Maarten





On Mar 8, 2010, at 16:01 , Ruth M. Ripley wrote:

> Dear Maarten,
>
> Do you want to change the others to 0? Or exclude them?  To do the  
> former:
>
> net[!net %in% c(1,2,3,4)] <- 0
>
> To exclude them the easiest way is to make them missing and use  
> na.omit:
>
> net <- na.omit(net)
>
> You will need to alter the real missings to something else, though eg
>
> net[is.na(net)] <- 999
>
> then do the other two lines and then
>
> net[net==999] <- NA
>
> Regards,
>
> Ruth
> --
> Ruth M. Ripley,                         Email:ruth at stats.ox.ac.uk
> Dept. of Statistics,                    http://www.stats.ox.ac.uk/~ruth/
> University of Oxford,                   Tel:   01865 282851
> 1 South Parks Road, Oxford OX1 3TG, UK  Fax:   01865 272595
>
>
> On Mon, 8 Mar 2010, Maarten Van Zalk wrote:
>
>> Dear Ruth,
>>
>> a follow-up question on using specific actors: is it possible to  
>> select a
>> range of scores? so for example the scores 1 until 4?
>>
>> Thanks for your help yet again!
>>
>> Maarten
>>
>> On Mon, Feb 15, 2010 at 12:59 PM, Ruth M. Ripley  
>> <ruth at stats.ox.ac.uk>wrote:
>>
>>> Dear Maarten,
>>>
>>> There are no special facilities: you would need to extract the  
>>> subsets of
>>> the matrices yourself before creating the Siena network object.  
>>> Using the
>>> command line, after reading in some data:
>>>
>>> friend.data.w1 <- as.matrix(read.table("s50-network1.dat"))
>>> friend.data.w2 <- as.matrix(read.table("s50-network2.dat"))
>>> drink <- as.matrix(read.table("s50-alcohol.dat"))
>>> smoke <- as.matrix(read.table("s50-smoke.dat"))
>>>
>>> To select the actors with the first column of smoke equal to 1, say,
>>>
>>> use <- smoke[, 1] == 1
>>>
>>> friendship <- sienaNet(array(c(friend.data.w1[use, use],
>>>      friend.data.w2[use, use]), dim=c(38, 38, 2)))
>>>
>>> alcohol <- sienaNet(drink[use, ], type="behavior")
>>>
>>> To do this via the gui, you would need to do the subsetting  
>>> outside R.
>>>
>>> Regards,
>>>
>>> Ruth
>>>
>>> PS I have copied this message to the rsiena-help mailing list. I  
>>> see two
>>> benefits to using the lists: others might find the information  
>>> useful too,
>>> and if I am busy someone else might be able to help!
>>> --
>>> Ruth M. Ripley,                         Email:ruth at stats.ox.ac.uk<Email%3Aruth at stats.ox.ac.uk 
>>> >
>>> Dept. of Statistics,                    http://www.stats.ox.ac.uk/~ruth/
>>> University of Oxford,                   Tel:   01865 282851
>>> 1 South Parks Road, Oxford OX1 3TG, UK  Fax:   01865 272595
>>>
>>>
>>> On Mon, 15 Feb 2010, Maarten Van Zalk wrote:
>>>
>>>> Dear Ruth,
>>>>
>>>> Is it possible in RSiena to select certain actors for the  
>>>> analysis? So
>>>> if you have a variable X you want to use to select individuals (for
>>>> example, all individuals with a score of 1), Can you select only  
>>>> these
>>>> individuals?
>>>>
>>>> Thanks for your help!
>>>>
>>>> Kind regards,
>>>>
>>>> Maarten Van Zalk
>>>>
>>>
>>>
>>
>