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Re: st: AW: Graph Plots with Date-Time


From   drreg@earthlink.net
To   statalist@hsphsun2.harvard.edu
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 <martin.weiss1@gmx.de>
>Sent: May 28, 2010 10:10 AM
>To: statalist@hsphsun2.harvard.edu
>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: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von drreg@earthlink.net
>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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