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Re: st: Graphing longitudinal profiles
From
Maarten Buis <[email protected]>
To
[email protected]
Subject
Re: st: Graphing longitudinal profiles
Date
Thu, 1 Dec 2011 17:40:34 +0100
On Thu, Dec 1, 2011 at 5:26 PM, Thomas Speidel <[email protected]> wrote:
> I am having difficulties creating a connected line graph for a longitudinal
> dataset. <snip>
> Notice the vertical line going from 13 to 19 on the y-axis. Why?
The problem are the missing values. The conect(L) starts a new line if
t[_n+1] < t[_n]. So for id 88 to id 93 there will be a line going from
19 to 14 at t=0, which is not what you want. One solution is in the
example below:
*------------ begin example ------------
drop _all
input id time value
84 0 15
84 1 18
84 2 17
88 0 19
88 1 .
88 2 .
93 0 14
93 1 19
93 2 19
94 0 16
94 1 20
94 2 20
97 0 13
97 1 .
97 2 .
98 0 17
98 1 19
98 2 20
99 0 17
99 1 18
99 2 20
end
sort id time
gen byte notmiss = !missing(value)
bys id : egen Nnotmist = total(notmiss)
twoway line value time if Nnotmist >=2 , connect(L)
*---------------- end example -----------------
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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