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Re: st: question on line graphs


From   Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: question on line graphs
Date   Sun, 18 Apr 2010 20:31:40 -0700

Dear Anant

  Will this do the trick...

******************************************
* CREATE FAKE DATASET
clear
set obs 10
generate year = 1995 + _n
expand 4
sort year
generate cohort = mod((_n-1),4)+1
tab year cohort
expand 100
generate tax = int(uniform()*5)+1
tab tax
recode tax (1 2=1 "1 or 2") (3 4 5=0 "3,4,5"), gen(rtax)
tab tax rtax
******************************************

* Start of real code

* collapse to get proportions
collapse rtax , by(cohort year)
* Convert to percentage
replace rtax = rtax*100
* separate into four variables by cohort
separate rtax, by(cohort)
* graph it
graph twoway (line rtax1 rtax2 rtax3 rtax4 year), ///
  xlabel(1996(1)2005, angle(45)) ///
legend(label(1 "Cohort 1") label(2 "Cohort 2") label(3 "Cohort 3") label(4 "Cohort 4"))

  And here is the graph that it creates

http://screencast.com/t/Y2FkZGQ0Y2U

  Hope that helps,

Michael N. Mitchell
See the Stata tidbit of the week at...
http://www.MichaelNormanMitchell.com

On 2010-04-18 8.06 PM, Thaker, Anant wrote:
I am a Stata 11/SE user. In my dataset, I have a cohort variable coded 1-4 with the various subgroups (e.g. 1 =<1934, 2 = 1934-1948, etc.), and an ordered variable that shows views on progressive taxation (coded 1-5 in terms of relative support). These data points are spread over a number of years (from the General Social Survey). I'm trying to chart out the % of respondents who selected 1 or 2 on the taxation variable, by cohort subgroup, over time. So the x-axis would be year, the y-axis would be "% who chose 1 or 2," and there would be four line graph series (one for each cohort subgroup). Would really appreciate some help! I can clarify as needed. Thanks!

Note: data is currently coded as this example:
YEAR  COHORT  TAXATION
2008  1965       1
YEAR  COHORT  TAXATION
1996  1975       3
...

Best,
Anant



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