{smcl}
{* 8mar2006} 
{hline}
help for {hi:numids}
{hline}

{title:Generating numeric identifiers for neighbours}

{p 8 17 2} 
{cmd:numids}
{it:locivar locjvar}
{cmd:,}
{cmdab:g:enerate(}{it:numid1var numid2var}{cmd:)} 
  

{title:Description} 

{p 4 4 2} 
{cmd:nunids} converts spatial neighbourhood information of the form 

{p 8 8 2}{it:locivar  locjvar}{p_end}
{p 8 8 2}{hline 7}{space 1}{hline 7}{p_end}
        123      456
        678      901

{p 4 4 2}or of the form 

        "TX"     "OK"
        "TX"     "NM"

{p 4 4 2} 
that is, using any numeric or string identifiers, into identifiers 
that are observation numbers 1, ..., _N. The order will be the sort 
order of {it:locivar}. 
    

{title:Remarks}

{p 4 4 2} 
{cmd:numids} is a utility for users of {cmd:spautoc}. 

{p 4 4 2}
It is assumed that every pair of neighbours is recorded twice, once as
i and j, once as j and i. If not, use {cmd:dupneigh} first. 


{title:Options}

{p 4 8 2}{cmd:generate(}{it:numid1var numid2var}{cmd:)} specifies two new variables
to contain numeric identifiers. It is a required option. 


{title:Examples}

{p 4 8 2}{cmd:. numids i j , gen(ni nj)}


{title:Author}

{p 4 4 2}Nicholas J. Cox, Durham University, U.K.{break} 
         n.j.cox@durham.ac.uk


{title:Also see}

{p 4 13 2} 
On-line: help for {help spautoc}, {help dupneigh}, {help neigh}