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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 like . 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-. Nick [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 task 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 works. The help seems to say it allows -twoway connected- graph options, but I keep getting error messages. I can't define line patterns, nor get the two sets of lines to go on the same 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)) * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:

**References**:**st: how do I overlay two linkplot graphs?***From:*Stephen Cox <[email protected]>

**st: SV: how do I overlay two linkplot graphs?***From:*"Kim Lyngby Mikkelsen (KLM)" <[email protected]>

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