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st: trouble with traveltime command


From   Valerie Orozco <Valerie.Orozco@toulouse.inra.fr>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: trouble with traveltime command
Date   Fri, 15 Feb 2013 10:35:08 +0000

I am interested in the « geocode » and « traveltime » Stata commands.
I have no problem with the "geocode" command. But I have some with the "traveltime" command. Indeed, I'm not able to obtain the travel distance the authors have on their paper in the Stata Journal (vol 11, nb 1, 2011). Here is the small example I use:

. list end_city- start_lat

     +---------------------------------------------------------------------------------------------------------+
     |                               end_city         start_city   end_long     end_lat   start_~g   start_lat |
     |---------------------------------------------------------------------------------------------------------|
  1. | 1500 market st, philadelphia, PA 19102   Philadelphia, PA   39.95239   -75.16619   39.95234   -75.16379 |
  2. |                       Philadelphia, PA   Philadelphia, PA   39.95234   -75.16379   39.95234   -75.16379 |
  3. |                          Allentown, PA   Philadelphia, PA   40.60843   -75.49018   39.95234   -75.16379 |
  4. |                          Lancaster, PA   Philadelphia, PA   40.03788   -76.30551   39.95234   -75.16379 |
     +---------------------------------------------------------------------------------------------------------+

When running traveltime, start_x(start_lat) start_y(start_long) end_x(end_lat) end_y(end_long)
I get : 

. list  end_city start_city days hours mins traveltime_dist

     +--------------------------------------------------------------------------------------------+
     |                               end_city         start_city   days   hours   mins   travel~t |
     |--------------------------------------------------------------------------------------------|
  1. | 1500 market st, philadelphia, PA 19102   Philadelphia, PA      0       0      3          . |
  2. |                       Philadelphia, PA   Philadelphia, PA      0       0      0         		 .                |
  3. |                          Allentown, PA   Philadelphia, PA      0       1     10      		   . |
  4. |                          Lancaster, PA   Philadelphia, PA      0       1     31      		    . |
     +--------------------------------------------------------------------------------------------+

What is wrong with the missing travel distance? Is it a google problem?

Thank you very much.
valérie


-------------------------------
Valérie OROZCO
Toulouse School of Economics (INRA-GREMAQ)
21, allée de Brienne
F-31000 Toulouse, France
 
MF 219
+33 5 61 12 85 91
-------------------------------


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