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Re: st: AW: Graph Plots with Date-Time
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[email protected]
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Subject
Re: st: AW: Graph Plots with Date-Time
Date
Fri, 28 May 2010 10:22:18 -0400 (EDT)
This email was sent to the Statalist in error. My apologies.
reg
-----Original Message-----
>From: Martin Weiss <[email protected]>
>Sent: May 28, 2010 10:10 AM
>To: [email protected]
>Subject: st: AW: Graph Plots with Date-Time
>
>
><>
>
>
>" Is there an easy way to drop observations when time is on the half-hour (1:30, 2:30, etc.)?"
>
>
>
>Use -drop if substr(time,-2,2)=="30"-.
>
>
>
>
>*************
>clear*
>
>input str15 time cdconc ws wd t
>"5/19/2010 13:00" .077 2 60 24.1
>"5/19/2010 13:30" .077 1.9 58 24.5
>"5/19/2010 14:00" .006 1.8 46 24.8
>"5/19/2010 14:30" .006 1.6 14 25.9
>"5/19/2010 15:00" .008 1.8 30 26.2
>"5/19/2010 15:30" .008 1.6 33 26.9
>"5/19/2010 16:00" .006 1.8 21 27.1
>"5/19/2010 16:30" .006 1.6 20 27.3
>"5/19/2010 17:00" .007 1.5 35 27.6
>"5/19/2010 17:30" .007 1.8 53 27.2
>"5/19/2010 18:00" .005 1.6 35 27
>"5/19/2010 18:30" .005 1.8 48 26.4
>"5/19/2010 19:00" 0 1.4 36 25.8
>"5/19/2010 19:30" 0 1.1 37 24.7
>"5/19/2010 20:00" .014 1 31 23.2
>"5/19/2010 20:30" .014 .9 33 22.2
>"5/19/2010 21:00" .004 .8 41 21.6
>"5/19/2010 21:30" .004 .6 35 20.9
>"5/19/2010 22:00" 0 .7 33 20.4
>"5/19/2010 22:30" 0 .7 44 20
>"5/19/2010 23:00" .007 .5 357 19.2
>"5/19/2010 23:30" .007 .4 351 19
>end
>
>list, noo
>
>drop if substr(time,-2,2)=="30"
>
>list, noo
>*************
>
>
>
>HTH
>Martin
>
>
>-----Ursprüngliche Nachricht-----
>Von: [email protected] [mailto:[email protected]] Im Auftrag von [email protected]
>Gesendet: Freitag, 28. Mai 2010 16:01
>An: Statalist
>Betreff: st: Graph Plots with Date-Time
>
>Serial number: 30110532867
>Licensed to: Reginald C. Jordan
>
>v.11 updated on WinXP
>
>Here is a partial dataset that I am attempting to work with:
>
>time cdconc ws wd t
>5/19/2010 13:00 .077 2 60 24.1
>5/19/2010 13:30 .077 1.9 58 24.5
>5/19/2010 14:00 .006 1.8 46 24.8
>5/19/2010 14:30 .006 1.6 14 25.9
>5/19/2010 15:00 .008 1.8 30 26.2
>5/19/2010 15:30 .008 1.6 33 26.9
>5/19/2010 16:00 .006 1.8 21 27.1
>5/19/2010 16:30 .006 1.6 20 27.3
>5/19/2010 17:00 .007 1.5 35 27.6
>5/19/2010 17:30 .007 1.8 53 27.2
>5/19/2010 18:00 .005 1.6 35 27
>5/19/2010 18:30 .005 1.8 48 26.4
>5/19/2010 19:00 0 1.4 36 25.8
>5/19/2010 19:30 0 1.1 37 24.7
>5/19/2010 20:00 .014 1 31 23.2
>5/19/2010 20:30 .014 .9 33 22.2
>5/19/2010 21:00 .004 .8 41 21.6
>5/19/2010 21:30 .004 .6 35 20.9
>5/19/2010 22:00 0 .7 33 20.4
>5/19/2010 22:30 0 .7 44 20
>5/19/2010 23:00 .007 .5 357 19.2
>5/19/2010 23:30 .007 .4 351 19
>
>var label type format
>time Time str15 %15s
>cdconc Cdconc float %9.0g
>ws WS float %9.0g
>wd WD int %8.0g
>t T float %9.0g
>
>Questions
>
>1. Is there an easy way to drop observations when time is on the half-hour (1:30, 2:30, etc.)?
>2. Ultimately, what I want to do is plot cdconc vs time, where time is 12AM, 3AM, 6AM, 9AM, etc. Does time need to be converted from a string variable and date-time formatted first? I've read through Cox,Getting nice time-of-day labels on a graph, SJ, February 2003, revised September 2003, but I don't know exactly how this helps me.
>3. In general, do you need to separate date and time before doing this sort of plot (cdconc vs. time)? If you do, how do you format the time part?
>
>Thanks much.
>
>*
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>
>*
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* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/