Re: st: Adjacency matrix in Stata

[Stas Kolenikov <skolenik@gmail.com>]

I would go with some sort of cluster analysis, as it creates adjacency
matrices (although I am not quite sure they come out by default from
Stata's implementation of -cluster-).


-- Stas Kolenikov, PhD, PStat (ASA, SSC)
-- Principal Survey Scientist, Abt SRBI
-- Opinions stated in this email are mine only, and do not reflect the
position of my employer
-- http://stas.kolenikov.name



On Sun, Mar 30, 2014 at 2:44 PM, jean-luc morin-chesnel
<jeanluc.morinchesnel@gmail.com> wrote:
> what i want to say is that (assume I have "only" 500 individuals)
> what would be the algorithm to obtain the adjacency matrix above in Stata?
>
> thanks again for your time
>
> On 30 March 2014 19:46, jean-luc morin-chesnel
> <jeanluc.morinchesnel@gmail.com> wrote:
>> Thank you very much, Stas!
>>
>> Maybe I can reduce my dataset to, lets say 5k individuals?
>> What would you do? Do you have other alternatives in mind?
>>
>> Thanks!
>>
>> JL
>>
>> On 30 March 2014 19:34, Stas Kolenikov <skolenik@gmail.com> wrote:
>>> It would be cumbersome whichever way you want to look at it. And at
>>> any rate Stata won't be able to store a 100K x 100K matrix... only 11K
>>> x 11K matrices (see -help limits- and -set matsize-).
>>>
>>> -- Stas Kolenikov, PhD, PStat (ASA, SSC)
>>> -- Principal Survey Scientist, Abt SRBI
>>> -- Opinions stated in this email are mine only, and do not reflect the
>>> position of my employer
>>> -- http://stas.kolenikov.name
>>>
>>>
>>>
>>> On Sun, Mar 30, 2014 at 11:55 AM, jean-luc morin-chesnel
>>> <jeanluc.morinchesnel@gmail.com> wrote:
>>>> Dear all,
>>>>
>>>> I have a panel dataset at the individual - day - product level
>>>> (unbalanced) and I would like to obtain a adjacency matrix in Stata,
>>>> but I do not know how to proceed.
>>>>
>>>> That is, I assume that 2 individuals are connected in the network if
>>>> they buy the same product the same day more than N times in my dataset
>>>> (lets say N=10).
>>>>
>>>> So I would like to obtain a matrix of adjacency in Stata: a MxM matrix
>>>> (M in the number of investors) where the coefficient mij=1 iff
>>>> investor i and investor j are connected in the network.
>>>>
>>>> I do not know how to proceed because I think that I should use loops,
>>>> but it seems to me that it is not very efficient to do so in Stata
>>>> (the dataset is large: 100k individuals). Any suggestion is very
>>>> welcomed.
>>>>
>>>> Many thanks,
>>>> Regards,
>>>>
>>>> JL
>>>> *
>>>> *   For searches and help try:
>>>> *   http://www.stata.com/help.cgi?search
>>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>>> *   http://www.ats.ucla.edu/stat/stata/
>>> *
>>> *   For searches and help try:
>>> *   http://www.stata.com/help.cgi?search
>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>> *   http://www.ats.ucla.edu/stat/stata/
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/faqs/resources/statalist-faq/
> *   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/