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st: RE: SV: how do I overlay two linkplot graphs?

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: SV: how do I overlay two linkplot graphs?
Date   Wed, 12 Dec 2007 14:56:13 -0000

Kim's suggestion won't work. -linkplot- cannot be used in this 
way, as it is only a stand-alone program and not also 
a -twoway- type. 

To answer the original question, and one of the doubts in 
Kim's reply, -linkplot- is a program from SSC. 

Only yesterday in a different thread I was saying,  

"Please remember the advice to specify where user-written 
commands you refer to may be located." 

That advice is spelled out in the FAQ, which all members 
are asked to read before posting. 

-linkplot- dates from 2003 and was written for version 8. 
One of its options is -plot()-. I will revise -linkplot-
to support also -addplot()- for users of Stata 9 or 10. 
-plot()- will still work in Stata 9 or 10, but is now undocumented. 

The criterion for -plot()- (or -addplot()-) is simple. Its argument 
must be capable of being fed to -twoway- as a -twoway- type. 
Stephen fed to -plot()- 

if task==1, linepattern(solid) if task==2, linepattern(dot)

but that isn't a self-contained -twoway- type call. Nor is it 
legal syntax for any other Stata purpose. Nor would something 

. linkplot score character, link(GRP) if task ==1, 
	plot(linkplot score character if task==2)

work, for the reason given in my first sentence. 

I can't work out from Stephen's posting precisely what he wants. 
He refers to variables -character1-character5- but he 
is trying graph calls using -character-. Unless -character- 
is a separate variable there is no way that is going 
to work. 

I have to guess at this stage that Stephen is expecting from 
-linkplot- something that goes way beyond its specification. 
It should do what is claimed in its help, but no more. 

Further progress might depend on Stephen posting a sample 
dataset with precisely his kind of structure. What he wants
will be plottable, but not necessarily with -linkplot-. 

[email protected] 

Kim Lyngby Mikkelsen

Overlaying graphs is done using the '||'-option between plots you want
to overlay. 

Try something like this:

linkplot score character if task==1, link(GRP) linepattern(solid) ||
linkplot score character if task==2, link(GRP) linepattern(dot))

Obs: everything should be written within the same line!
Obs: I am not familiar with the linkplot command, and I do not know if
the part of your command after the comma is correct. I have removed your
specification of 'plot' as I can see that this option requires an
argument, which I think might be the name of another plot you have
previous saved.

Stephen Cox (edited) 

For each case, I have 2 (task 1, task 2) sets of 5 variables (character1
- 5). 
I want to do a -linkplot- across the 5 character variables, one for each
set, but overlayed, and with a different line patterns for each tasks.

I'm quite new to Stata, and can't work out how the -plot()- option
The help seems to say it allows -twoway connected- graph options, but I
getting error messages.

I can't define line patterns, nor get the two sets of lines to go on the
graph. I am obviously not using the -plot()- options correctly here, but
can't work out how.

Here is one of the many many attempts I have had:

. linkplot score character, link(GRP) plot (if task==1,
linepattern(solid) if task==2, linepattern(dot))

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