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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: getting Stata to read a bizarre sequence of dates |

Date |
Wed, 13 Jun 2012 02:10:54 +0100 |

You've posted numerous questions on this kind of data over the last few weeks, to which there have been numerous answers, so why you ask this question seems especially mysterious. First, Stata _is_ reading your string dates and it _is_ converting them to numeric dates. So the implication that Stata can't read these data is quite wrong. The only problem evident is that there is one gap in this dataset even when you restructure it as a series with spacing 28 days. So, what -tsset- reports is essentially "fair comment". There is a gap at 638 as the following reveals. . format edate1 %td . tab edate1 edate1 | Freq. Percent Cum. ------------+----------------------------------- 23nov2008 | 2 14.29 14.29 28dec2008 | 2 14.29 28.57 25jan2009 | 2 14.29 42.86 22feb2009 | 2 14.29 57.14 29mar2009 | 2 14.29 71.43 26apr2009 | 2 14.29 85.71 24may2009 | 2 14.29 100.00 ------------+----------------------------------- Total | 14 100.00 . tab edate2 edate2 | Freq. Percent Cum. ------------+----------------------------------- 637 | 2 14.29 14.29 639 | 2 14.29 28.57 640 | 2 14.29 42.86 641 | 2 14.29 57.14 642 | 2 14.29 71.43 643 | 2 14.29 85.71 644 | 2 14.29 100.00 ------------+----------------------------------- Total | 14 100.00 By the way, posting code that others can run is an excellent idea, but cut the -cd d:- which assumes that users have a d: drive, which may be quite wrong. Nick On Wed, Jun 13, 2012 at 12:37 AM, stef salvez <loggyedy@googlemail.com> wrote: > I have the following panel data set > > clear all > cd d:\ > input str8 (dates1) id > "23/11/08" 1 > "28/12/08" 1 > "25/01/09" 1 > "22/02/09" 1 > "29/03/09" 1 > "26/04/09" 1 > "24/05/09" 1 > "23/11/08" 2 > "28/12/08" 2 > "25/01/09" 2 > "22/02/09" 2 > "29/03/09" 2 > "26/04/09" 2 > "24/05/09" 2 > > end > > the difference (in days) between successive dates is 35 28 28 35 28 28 > > The problem is that I do not know how to convert these string dates > into numeric variables given the fact that I have 2 jumps (35 days) > if i issue the commands > > gen edate1 = date(dates1, "DM20Y") > gen edate2 = floor(edate1/28) > tsset id edate2 > > I get the following error message > > panel variable: id (strongly balanced) > time variable: edate2, 637 to 644, but with gaps > delta: 1 unit > > Is there any code that could fix that so as to get Stata to "read" > that "bizarre"sequence of dates? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: getting Stata to read a bizarre sequence of dates***From:*joales salbdralor <joalessakafiora@googlemail.com>

**References**:**st: getting Stata to read a bizarre sequence of dates***From:*stef salvez <loggyedy@googlemail.com>

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