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st: review of stata 10 time series


From   Robert A Yaffee <bob.yaffee@nyu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: review of stata 10 time series
Date   Fri, 31 Jul 2009 07:30:37 -0400

Nick,
   This is the reference to which I was referring in yesterday's
chat:   http://www.jstatsoft.org/v23/s01/
   Regards,
      Bob

Robert A. Yaffee, Ph.D.
Research Professor
Silver School of Social Work
New York University

Biosketch: http://homepages.nyu.edu/~ray1/Biosketch2009.pdf

CV:  http://homepages.nyu.edu/~ray1/vita.pdf

----- Original Message -----
From: Nick Cox <n.j.cox@durham.ac.uk>
Date: Friday, July 24, 2009 1:14 pm
Subject: st: RE: Adding a Reference Point to a -tabplot- Graph
To: statalist@hsphsun2.harvard.edu


> You'd need to replicate -tabplot-'s internal logic. So for example the
> height of the top of each bar is in essence 
> 
> category_code (1, 2, 3, etc.) 
> 
> PLUS 
> 
> [(Frequency in cell)/(Maximum frequency over all cells)] 
> * Maximum height of bar 
> 
> So you'd need to replicate that kind of calculation for whatever you
> were superimposing on top. 
> 
> My guess is that this is entirely possible but not trivial. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Marshall Garland
> 
> I'm attempting to generate graphs across multiple levels (schools)
> that display the percentage of students within a particular school and
> within a particular subgroup (let's say, gender, or ethnicity, etc.)
> that accomplished a particular task. The data are longitudinal, so
> these outcomes are captured across multiple years (two, to be
> precise). Thus, my X and Y variable are both categorical. -tabplot-,
> of course, works brilliantly for this.
> 
> However, I would also like to add a reference point to each category
> that shows the aggregate percentage (that is, across all schools in a
> given year, not just a particular one) for each task for each student
> subgroup. It seems as though some overlay using the addplot option for
> -tabplot- would work, but I can't seem to figure out how to do this.
> I've experimented with using -combine graph- to add additional figures
> of the aggregate results for each year, but I'm unhappy with the
> results.
> 
> Here's my syntax thus far:
> 
> ***figure 2***
> levelsof school_name, local(levels)
> foreach school_name of local levels {
> 	tabplot ethniccode enroll_type_final, by (hs_grad_year)
> percent(ethniccode hs_grad_year) ytitle(, orient(hor)) ///
> 	scheme(s2color) showval ///
> 	ylabel(, nogrid) legend(nostack rows(1) size(small) nobox
> region(lcolor(white) lwidth(vvvthin))) ///
> 	xtitle(`school_name') xtitle(, justification(center)) ///
> 	by(, note(, color(white)))
> }
> 
> My data look like this:
> 
> Student	School	Year	Y	X
> 1	A	2007	1	3
> 2	A	2008	3	2
> 4	B	2008	4	5
> 5	B	2007	1	4
> 7	C	2007	2	2
> 8	C	2008	4	4
> 
> Any ideas or recommendations would be greatly appreciated.
> 
> Cheers,
> 
> -Marshall
> 
> -tabplot- reference:
> http://www.stata-journal.com/sjpdf.html?articlenum=gr0004
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