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Re: st: RE: Connecting Data Points with Lines


From   Jielu Lin <jielu.lin@case.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Connecting Data Points with Lines
Date   Fri, 30 Apr 2010 15:45:59 -0400

Sorting won't solve the problem but xtline did! Thank you so much, Nick!

On Fri, Apr 30, 2010 at 1:52 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> See if
>
> sort id age
>
> before the graph command solves the problem. Note that if your estimated
> trajectories are not monotone increasing for every individual, then the
> request is contradictory.
>
> See also -xtline-.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Jielu Lin
>
> I'm modeling age-graded trajectories. Each individual case in my data
> has 4 repeated observations. Then I tried to graph estimated
> individual trajectories. Each individual should have a separate
> trajectory which is not connected to another individual trajectory. In
> the actual graph, within a person, the 4 estimated data points were
> correctly connected. However, some trajectories were connected even
> though these observations did not belong to the same person. This
> happened to some cases, but not all of them. I've been for patterns of
> these odd connections but so far it seems random.
>
> I used the following codes:
>
> xtmixed y age ||id: age, mle cov(un)
> predict y_fitted, fitted
> twoway line y_fitted age, connect(ascending)
>
> Whether I use the codes or the pull-down menu gives me the same thing.
>
>
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