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

 From moleps 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?
>>>
>>>
>>> *
>>> *   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:
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>> *   http://www.ats.ucla.edu/stat/stata/
>>
>>
>> *
>> *   For searches and help try:
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>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>
>
> *
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>
>
> *
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*
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```