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Re: st: Translate Google Trends date system into Stata date system


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Translate Google Trends date system into Stata date system
Date   Wed, 1 May 2013 17:49:41 +0100

That's another good method. The temporary variables are not needed, however.

generate date1=date(substr(googledate, 1, 10),"YMD")
generate date2=date(substr(googledate, 10, .), "YMD")
format date1 date2 %td

Nick
njcoxstata@gmail.com


On 1 May 2013 17:21, Sergiy Radyakin <serjradyakin@gmail.com> wrote:
> tempvar d1 d2
> generate `d1'=substr(googledate,1,10)
> generate `d2'=substr(googledate,-10,.)
> generate date1=date(`d1',"YMD")
> generate date2=date(`d2',"YMD")
> format date1 %td
> format date2 %td
> list
>
>
>
>
> On Tue, Apr 30, 2013 at 3:13 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>
>> That's fine.
>>
>> But in order that no-one gets confused:
>>
>> 1. -parse()- here is the name of an option.
>>
>> 2. -parse- is a quite distinct and out-of-date command.
>>
>> The connection is only that I had parsing in mind when I wrote the
>> original version of -split-, itself a rewrite of -strparse- by Michael
>> Blasnik and myself, still visible on SSC.
>>
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 30 April 2013 20:05, Stephen Cranney <scranney@sas.upenn.edu> wrote:
>>> The split and -parse- commands worked perfectly for my purposes. Thank you.
>>>
>>> On Tue, Apr 30, 2013 at 2:38 PM, Phil Schumm <pschumm@uchicago.edu> wrote:
>>>> On Apr 30, 2013, at 1:27 PM, Stephen Cranney wrote:
>>>>> I'm trying to get long series of dates I downloaded from Google Trends to function in Stata.  Unfortunately, Google Trends's way of doing dates makes this difficult. An example value from a single observation:
>>>>>
>>>>>     2004-01-04 - 2004-01-10
>>>>>
>>>>> This represents the week of January 04, 2004 to January 10, 2010.  However, Stata is (understandably) reading this as a string variable.  Is there a way to take variables like this and break them into a beginning date and ending date or something similar?
>>>>
>>>>
>>>> Several ways, e.g.,
>>>>
>>>>     if regexm("2004-01-04 - 2004-01-10","^([0-9\-]+) - ([0-9\-]+)$") ///
>>>>         di %td date(regexs(1),"YMD"), %td date(regexs(2),"YMD")
>>>>

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