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Re: st: twoway graph, with by and combine

From   Eric Booth <>
To   "<>" <>
Subject   Re: st: twoway graph, with by and combine
Date   Sun, 1 May 2011 15:00:47 +0000


You can specify each line separately with an -if-:
 sysuse auto, clear
 tw (lfit price mpg if rep78==1) (lfit price mpg if rep78==2) ///
  (lfit price mpg if rep78==3, lpattern(dash)) (lfit price mpg if rep78==4, lpattern(dot))

**or build the command using macros 
**** to avoid manually typing all categories of your ID:

 levelsof rep78, loc(ll)
 foreach v in `ll' {
 	loc gr (lfit price mpg if rep78==`v')  `gr'

tw (scatter price mpg) `gr' ,  ///
/* you can differentiate the lines by 
changing the lpatterns,
or you can edit the label 
with an option like: */ ///
 	legend(on order(1 "Dots" 2 "Rep78 Category 2" 3 "three"))

- Eric
Eric A. Booth
Public Policy Research Institute
Texas A&M University
Office: +979.845.6754

On May 1, 2011, at 9:44 AM, Hoffman, George wrote:

> I've got panel data  and want to display the by(id) linear fit lines  on one graph.
>         twoway (fit y x, by(id)) 
> works, but gives different plots for all id's.  combine is not an option for by in this command.
> Is there a quick way, or user-written way, to get the above on one graph? 
> Seems simple, but I can't find it.
> Thank you in advance
> George Hoffman
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