12/18/2022 0 Comments Geodist install stata![]() ![]() Other optional options can also be added.īy default, this command generates distances in kilometers. The option of generate()is necessary, and allows us to specify the name of the variable that will be generated to store the distance between the two locations. The latitude must always be written before the longitude. The first two arguments are the latitude and longitude of the first location, followed by the latitude and longitude of the second location. The general syntax of the command is as follows: geodist lat1 lon1 lat2 lon2, generate(new_dist_var) Stata’s working directory can be changed through: cd “directory path” Syntax of geodist Make sure the working directory of your Stata file is the same as the working directory of the data file. ![]() > I expect there's a straightforward way to do this.To load the dataset, we type: use "distance.dta", clear > (b) sum up the results of these computations, returning a value which I, doing computations involving variables > For every observation i, I think I need to > loop over all observation and sum up the results. > latitude for each observation, and computation of the distance from any > distances between observation i and all j n.e. > The variable created is a weighted sum of the inverse of geographical > I have need to use information from all observations (about 1800 of > running sum, take a look at -help sum(). > If you want the total of a variable, look at -egen, total(). > the easiest is simply to -generate- a sum by adding values with a "+" > Creating sums can mean different things in Stata. ![]() sum up the results of these computations,". > to all other observations (or more generally, to some set of other > observation, the sum I'm talking about is of measurements made relative > Thanks, I guess I was unclear on this aspect of the problem. > To: Subject: st: RE: RE: AW: Creating index relative to other observations > On Fri, at 7:49 AM, Frederick Guy wrote: > geodist lat lon `=lat' `=lon' if _n != `i', gen(d) > is then updated with the value of the sum plus the value of x2 for > according to the distance to `i' and summed. > distance from observation `i' to all others (distance will be missing > Perhaps the following example is close to what you are trying to do. > To: Subject: Re: st: RE: RE: RE: AW: Creating index relative to other observations If I just stack observations type i on top of observations type j, geodist doesn't like the missing values (observations type i have missing values for type j, and vice versa). For each location of type i, I need to compute the distances to every location of type j. > Robert Picard sent the code below, which works as advertised - many thanks, Robert! Now I have a slightly different problem: I have two kinds of locations in the data, i and j. > On Fri, at 4:35 AM, Frederick Guy wrote: > * This example require my -geodist- program available on SSC > updated version of my example the looping is over all observations of > set of observations side-to-side and it's easier to manage. > to append both datasets but to do an unmatched merge. ![]() > If you have two kinds of locations, then the easiest solution is not > To: Subject: Re: st: looping with geodist Just one (I hope) more question: I'm using Stata 10, and am not sure what the equivalent of "merge 1:1 _n" is. The version 10 syntax is "merge using "`f'" Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |