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Re: AW: st: RE: Graphing time on the x axis


From   moleps <moleps2@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: AW: st: RE: Graphing time on the x axis
Date   Mon, 21 Dec 2009 21:50:32 +0100

To me there doesnt seem to be any difference between the sets, but doing the following explains why the graph looks as it does. However I do not understand how this comes about or how I can rectify it...



. list x in 1/5

     +----------+
     |        x |
     |----------|
  1. | 00:00:00 |
  2. | 00:00:18 |
  3. | 00:00:30 |
  4. | 00:00:36 |
  5. | 00:01:06 |
     +----------+

. sort x

. list x in 1/5

     +----------+
     |        x |
     |----------|
  1. | 05:10:24 |
  2. | 05:10:30 |
  3. | 05:10:36 |
  4. | 05:10:42 |
  5. | 05:10:48 |
     +----------+


M



On 21. des. 2009, at 21.18, Martin Weiss wrote:

> 
> <>
> 
> How is your dataset different from the one I am playing with?
> 
> 
> *******
> clear*
> set obs 1000
> set seed 10234
> 
> gen x=(_n-1)*6000
> 
> format x %tc_HH:MM:SS
> 
> gen mean_amp =rnormal()
> gen meanp =rnormal()
> 
> gen byte c7=(runiform()<.2)+1
> 
> compress
> 
> tw (line mean_amp x if c7==1) /* 
> */ (line mean_amp x if c7==2) /* 
> */ (line meanp x if c7==1)  /* 
> */ (line meanp x if c7==2)
> *******
> 
> 
> HTH
> Martin
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of moleps
> Sent: Montag, 21. Dezember 2009 20:32
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: AW: st: RE: Graphing time on the x axis
> 
> picture of the graph
> 
> http://www.flickr.com/photos/45805518@N04/?saved=1
> 
> commands
> 
> 
> 
> 
> 
> . format x %td_HH:MM:SS
> 
> . list x in 1/5
> 
>     +----------+
>     |        x |
>     |----------|
>  1. | 00:00:00 |
>  2. | 00:00:18 |
>  3. | 00:00:30 |
>  4. | 00:00:36 |
>  5. | 00:01:06 |
>     +----------+
> . tw (line  mean_amp x if c7==1) (line  mean_amp x if c7==2) (line   meanp x
> if c7==1) (line   meanp x
>> if c7==2)
> 
> Regards,
> 
> M
> 
> 
> 
> On 21. des. 2009, at 19.57, Martin Weiss wrote:
> 
>> 
>> <> 
>> 
>> 
>> You should probably reproduce the problem with a dataset shipped with
> Stata.
>> Is the time variable numeric or string?
>> 
>> 
>> 
>> HTH
>> Martin
>> 
>> 
>> -----Ursprüngliche Nachricht-----
>> Von: owner-statalist@hsphsun2.harvard.edu
>> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von moleps
>> Gesendet: Montag, 21. Dezember 2009 19:48
>> An: statalist@hsphsun2.harvard.edu
>> Betreff: Re: st: RE: Graphing time on the x axis
>> 
>> Maybe I was unclear in my description of the graph, but i dont think it is
> a
>> scale or label question. The problem is that given the coordinates (00:00,
>> 2.3) (05:36,1.9) (07:20,3.1) (18:58,2.9) they are not graphed in that
> order;
>> Instead I have (07:20,3.1) (18:58,2.9) (00:00, 2.3) (05:36,1.9) ... 
>> 
>> Regards 
>> 
>> M
>> 
>> 
>> On 21. des. 2009, at 13.45, Nick Cox wrote:
>> 
>>> Clearly you need to specify your own. 
>>> 
>>> A convenience tool is -mylabels- from SSC. You just need to specify the
>> conversion from Stata's underlying scale, presumably milliseconds, to your
>> desired scale, which may be hours (you don't say what you want instead).
> See
>> the help for more. 
>>> 
>>> Nick 
>>> n.j.cox@durham.ac.uk 
>>> 
>>> moleps islon
>>> 
>>> I´ve created a variable, time, for two measurements that both have
>>> been subtracted from the starting time of the measuerement so that the
>>> two  start out with time 00:00:00 and I have measurements every 10
>>> sec. However after doing a twoway plot the starting point is not
>>> 00:00:00. Instead I have these tick marks and values along the x
>>> axis:: 07:20--12:53--18:58--00:00--05:36.... Any ideas?
>>> 
>>> 
>>> *
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>> 
>> 
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