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RE: st: number of dates in x axis
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
RE: st: number of dates in x axis
Date
Tue, 24 May 2011 19:15:54 +0100
Nick
[email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Maria Ana Vitorino
Sent: 24 May 2011 19:11
To: [email protected]
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
> [email protected]
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]
> ] On Behalf Of Maria Ana Vitorino
> Sent: 24 May 2011 18:29
> To: [email protected]
> 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
>> <[email protected]> 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)
>>>
>
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