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From |
"David Radwin" <dradwin@mprinc.com> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Arrow diagram connecting before and after categories |

Date |
Tue, 7 Aug 2012 09:04:31 -0700 (PDT) |

Stata 12 does include a facility for drawing path models as part of its structural equation modeling capability. I'm not sure if it will solve your problem or not. See http://www.stata.com/stata12/structural-equation-modeling for an example. David -- David Radwin Senior Research Associate MPR Associates, Inc. 2150 Shattuck Ave., Suite 800 Berkeley, CA 94704 Phone: 510-849-4942 Fax: 510-849-0794 www.mprinc.com > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- > statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox > Sent: Tuesday, August 07, 2012 2:16 AM > To: statalist@hsphsun2.harvard.edu > Subject: Re: st: Arrow diagram connecting before and after categories > > -linkplot- is from SSC. Please note the request to explain where > user-written programs you refer to come from. I see no problem in > using one y variable with different labels, as marker labels exist for > that purpose. > > Multiple arrows from one node (vertex) to several others are no > problem so long as each edge or link is represented by an observation. > Thus if a preliminary diagnosis is refined to a final diagnosis for > various persons > > "A" "beginner problem" "didn't read manual" > "A" "beginner problem" "model wrong for data" > "A" "beginner problem" "needs new code" > "B" "beginner problem" "syntax error" > "C" "beginner problem" "data wrong for model" > "C" "beginner problem" "version conflict" > > that is unproblematic so long as the data structure is as above. > > Your problem thus sounds easy but see for details > > Cox, N.J. 2009. Paired, parallel, or profile plots for changes, > correlations, and other comparisons. > Stata Journal 9(4): 621-639 > > Abstract. Paired, parallel, or profile plots showing the values of > two variables may be constructed readily using a combination of graph > twoway commands. This column explores the principles and practice of > such plot-making, considering both wide and long (panel or > longitudinal) data structures in which such data may appear. > Applications include analysis of change over time or space and indeed > any kind of correlation or comparison between variables. Such plots > may be extended to show numeric values and associated name > information. > > That said, it is not clear how effective such graphs will be as > numerous identical links are shown by the same arrow and Stata doesn't > readily support lines proportional in thickness to some other > variable. Depending on how many diagnoses you have I am led to suggest > -tabplot- (SSC) as an alternative. > > Nick > > On Mon, Aug 6, 2012 at 11:56 PM, Mollie Hogan <hogan@post.harvard.edu> > wrote: > > > I am hoping to get some help with a graphing issue. I'm trying to > > create what I can best describe as a before/after arrow diagram > > showing reclassification of categorical variables. > > > > I have a dataset where each observation is one death. Each death goes > > through a review process, and I have one variable showing the cause of > > death before the review process, and another variable showing the > > cause of death after the review process. I want a diagram that has, on > > the left side, the list of causes BEFORE the review and then on the > > right side, the list of causes AFTER the review. I want each case > > represented by a line connecting the appropriate before and after > > causes. Pretty straightforward, right? The hitch is that the "before" > > categories are in broad groupings and the "after" causes are more > > specific than that. So the list of causes before and after is not the > > same. > > > > I have tried several things: linkplot got me the closest, but I cannot > > label the "before" and "after" categories with different labels (since > > it's just the one yvar). I have started trying to overlay many line > > graphs, and then add text manually, but I have quite a lot of > > categories and thought I would ask and see if anyone has any other > > thoughts about a good approach or user-written command that might do > > the trick. > > > > I am running Stata 11.2 on a Mac, but can access 12.1 on Windows if > > the solution lies there! * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Arrow diagram connecting before and after categories***From:*Mollie Hogan <hogan@post.harvard.edu>

**Re: st: Arrow diagram connecting before and after categories***From:*Nick Cox <njcoxstata@gmail.com>

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