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Re: st: question about traveltime
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: question about traveltime
Date
Thu, 29 Nov 2012 18:36:42 +0000
The latter qualms do you credit but there is a version on SSC from
2012820, which you should try.
Nick
On Thu, Nov 29, 2012 at 5:10 PM, Lance Erickson <[email protected]> wrote:
> Scott is correct that Google's interface has changed. I contacted the authors months ago and shared my solution with them. I believe they have incorporated the changes into their code but from what I can tell they have not updated it with SSC. You should be able to get an update if you email the authors directly.
>
> I don't have any personal reasons for not sharing my solution although I haven't not gone through a rigorous testing process that I imagine would be desirable for distribution. Also, I'm not exactly sure what the norms are for sharing changes to someone else's code.
>
> Lance
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of Scott Merryman
> Sent: Thursday, November 29, 2012 7:12 AM
> To: [email protected]
> Subject: Re: st: question about traveltime
>
> On Wed, Nov 28, 2012 at 8:53 AM, nola l <[email protected]> wrote:
>> Hello,
>>
>> I would like to try "traveltime" ado that was developed by Ozimek and
>> Miles. It supposed to calculate the travel time of two points. I used
>> the example that were listed in their paper (the stata Journal 2011,
>> 11, Number 1, pp.106-119).
>>
>> I am using Stata12 and the data input as follow:
>>
>>
>> start_lat start_long end_lat end_long mode
>> 39.95234 -75.16379 40.60843 -75.49018 1
>>
>> 39.95234 -75.16379 39.9626 -76.72775 3
>>
>> the command is : traveltime, start_x (start_lat) start_y(start_long)
>> end_x (end_lat) end_y (end_long) mode (mode)
>>
>>
>>
>> However I got the results as follow which must be wrong (doesn't match
>> the results that Ozimek and Miles listed in their paper):
>>
>> start_lat start_long end_lat end_long mode days hours
>> mins travel~t
>> 39.95234 -75.16379 40.60843 -75.49018 1 0 0
>> 0 0
>>
>> 39.95234 -75.16379 39.9626 -76.72775 3 0 0
>> 0 0
>>
>> Did I make any mistake and get those "error" results? Or this command
>> doesn't work any more?
>>
>
> -traveltime- uses GoogleMaps to calculate the travel time, perhaps the GoogleMaps interface has changed since the Stata Journal article was written.
>
> I would recommend you contact the authors directly.
>
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