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Re: st: question on line graphs

From   Michael Norman Mitchell <>
Subject   Re: st: question on line graphs
Date   Sun, 18 Apr 2010 20:31:40 -0700

Dear Anant

  Will this do the trick...

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

  Hope that helps,

Michael N. Mitchell
See the Stata tidbit of the week at...

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:
2008  1965       1
1996  1975       3


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