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From |
Nick Cox <n.j.cox@durham.ac.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: number of dates in x axis |

Date |
Tue, 24 May 2011 20:05:00 +0100 |

You are burdening me with questions that I can't answer! You are not showing me the code that fails. Also, you are guessing again. But it seems that you have daily dates. Applying a %tm format to daily dates is legal but pointless. It gives you a result that does not apply to your dates. The number 18110 is (D) 1 August 2009 as a daily date _but_ (M) March 3469 as a monthly date, i.e. a date almost 1460 years into the future. That's what But that is not going to fail. In my first post I gave an example of a format for daily dates that shows month and year: %d_m_Y. I am going to try a third and last time. If you show me the code that fails, I will try to tell you your mistake. Otherwise what you don't tell us remains inscrutable. Nick n.j.cox@durham.ac.uk Maria Ana Vitorino Thanks. My code is a little more complicated than the example so I didn't want to burden you with it. But I understand your position. I think the issue has to do with the formatting of the date variable...I can't seem to get it to work. This is what I'm getting: . generate date1=date(date,"MY") . format date1 %tm . list date1 date in 1 +------------------+ | date1 date | |------------------| 1. | 3469m3 Aug2009 | +------------------+ What am I doing wrong? Thanks, Ana On May 24, 2011, at 2:18 PM, Nick Cox wrote: > % sacrificial line. > > Nick > n.j.cox@durham.ac.uk > > > -----Original Message----- > From: Nick Cox > Sent: 24 May 2011 19:16 > To: 'statalist@hsphsun2.harvard.edu' > Subject: RE: st: number of dates in x axis > > Please: I want to see the _exact_ code you typed. No commentary, no > paraphrase, no speculation. If you want to debug your code yourself, > feel free to do so. If you want me to try to debug your code, I am > happy to try, but that means your code, not your thoughts about what > might be wrong with your code. > > Nick > n.j.cox@durham.ac.uk > > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu > ] On Behalf Of Maria Ana Vitorino > Sent: 24 May 2011 19:11 > To: statalist@hsphsun2.harvard.edu > Subject: Re: st: number of dates in x axis > > I tried your code again (this time by pasting it into the do-file > editor instead into the command window) and it worked. But my version > is not working (I still get the invalid label specifier message). > Could it be because my time variable has gaps? Also, how can one setup > the "11" in your for loop without having to make mental calculations > regarding the number of months? > Thanks for the help! > Ana > > > On May 24, 2011, at 1:31 PM, Nick Cox wrote: > >> Yes. Show me the _exact_ code you typed. >> >> Nick >> n.j.cox@durham.ac.uk >> >> >> -----Original Message----- >> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu >> ] On Behalf Of Maria Ana Vitorino >> Sent: 24 May 2011 18:29 >> To: statalist@hsphsun2.harvard.edu >> Subject: Re: st: number of dates in x axis >> >> Thanks Nick. >> I tried running your example but I got the error message "invalid >> label specifier, : 15341 15400 15461 ..." >> Any suggestions? >> Thanks! >> Ana >> >> On May 24, 2011, at 4:20 AM, Nick Cox wrote: >> >>> There is relevant material at >>> >>> Stata 7: How can I get "nice" date labels on a graph? >>> >>> http://www.stata.com/support/faqs/graphics/nicedate.html >>> >>> StataCorp have added this annotation: >>> >>> "Note: This FAQ is relevant for users of releases prior to Stata 8. >>> For Stata 8 see update from 12 September 2003." >>> >>> In fact the techniques there do remain useful for some problems. >>> >>> Here's an example with different data. Here I decide that I want >>> labels every 2 months from 1 January 2002 to 1 January 2003. I loop >>> over the dates and put them in a bag, namely a local macro. >>> >>> sysuse xtline1 >>> xtset person day >>> >>> forval i = 1(2)11 { >>> local thisdate = mdy(`i', 1, 2002) >>> local mydates `mydates' `thisdate' >>> } >>> >>> local thisdate = mdy(1,1,2003) >>> local mydates `mydates' `thisdate' >>> >>> xtline calories, overlay xlabel(`mydates', format(%d_m_Y) ang(v)) >>> >>> See also >>> >>> SJ-7-4 gr0030 . Stata tip 55: Better axis labeling for time >>> points/ >>> intervals >>> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >>> N. J. Cox >>> Q4/07 SJ 7(4):590--592 (no >>> commands) >>> tip on labeling graphs for time points and time intervals >>> >>> >>> On Tue, May 24, 2011 at 4:45 AM, Maria Ana Vitorino >>> <vitorino@wharton.upenn.edu> wrote: >>> >>>> I have the following data: >>>> >>>> >>>> +------------------------+ >>>> | Person Weight Date | >>>> |------------------------| >>>> 1. | Name1 50 17988 | >>>> 2. | Name1 55 18110 | >>>> 3. | Name1 50 18141 | >>>> 4. | Name1 45 18171 | >>>> 5. | ... . . | >>>> |------------------------| >>>> 6. | Name2 85 18110 | >>>> 7. | Name2 88 18171 | >>>> 8. | Name3 68 17988 | >>>> 9. | ... . . | >>>> 10. | .. . . | >>>> |------------------------| >>>> 11. | NameN . . | >>>> +------------------------+ >>>> >>>> The labels for the date variables are the months' names (plus year) >>>> (e.g. >>>> "jan2006", "feb2007", etc) >>>> >>>> If I do something like: >>>> >>>> xtline Weight , overlay i(Person) t(Date) xlab(, valuelabel) >>>> >>>> The month names show up on the xaxis BUT only every 6 months or so. >>>> How can >>>> I control the number of "ticks" (AND month names ) that show up on >>>> the >>>> x-axis? (suppose I want a tick every 2 months or even every month) >>>> >> >> * >> * 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/ > > * > * 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/ > > * > * 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/ * * 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/ * * 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: number of dates in x axis***From:*Maria Ana Vitorino <vitorino@wharton.upenn.edu>

**References**:**st: number of dates in x axis***From:*Maria Ana Vitorino <vitorino@wharton.upenn.edu>

**Re: st: number of dates in x axis***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: number of dates in x axis***From:*Maria Ana Vitorino <vitorino@wharton.upenn.edu>

**RE: st: number of dates in x axis***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: number of dates in x axis***From:*Maria Ana Vitorino <vitorino@wharton.upenn.edu>

**RE: st: number of dates in x axis***From:*Nick Cox <n.j.cox@durham.ac.uk>

**RE: st: number of dates in x axis***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: number of dates in x axis***From:*Maria Ana Vitorino <vitorino@wharton.upenn.edu>

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