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From |
Jeremy Voros <jeremyvoros@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Graphing the median of a list of variables |

Date |
Wed, 28 Apr 2010 12:42:10 -0400 |

With some data clean up and using -collapse - (thank you Nick!) I have a table containing the data I'd like to graph, though I had each year on it's own row and each question as a column. -xpose- let me transpose the data to make generating the line graph I wanted easy enough. Didn't need -reshape- after all. Thanks for the help. -- Jeremy On Apr 28, 2010, at 6:30 AM, Nick Cox wrote: > It now does sound like a -reshape- before you draw a graph. > > Nick > n.j.cox@durham.ac.uk > > Jeremy Voros > > -collapse- looks like it might be the tool I'm looking for. But, the > data I have are self-assessments of competency in a variety of areas. > The mean increases as the year increases. I'm trying to devise a method > of visualizing the responses to all the questions improving over time. > Putting the year along the x-axis would require a separate graph line > for each question, of which I have approximately 50, which is too many > for such a graph. > > -grmeanby- is useful too, but it also will only summarize data for a > single variable. > > I'm thinking if I could turn my column variables into row values I'd be > able to get what I want. So I could have a table like so: > > | question | median_1999 | median_2001 | etc, for each > year > | 1 | 2 | 3 | > | 2 | 4 | 5 | > > then the line graph would be trivial. > > I might need to consider another visualization method. > > And thanks for the suggestion on the mean. > > On Apr 27, 2010, at 2:12 PM, Nick Cox wrote: > >> No; I would use -collapse- first. >> >> collapse (p50) question*, by(year) >> >> After that, it's just a -line- plot. I'd put year on the x axis; any >> other design may seem less intuitive to your readership. >> >> By the way, even though the data are Likert scales, in my experience >> means in practice often do a much better job of summarising level >> (regardless of measurement theory). > > Jeremy Voros > >> Stata newbie here with a question I'm having trouble finding an answer >> for. I would like to create a line graph with variables along the > x-axis >> and their median on the y-axis, with a different line for each > variable >> based on the cohort year. Here's the details: >> >> My database of likert-scale survey data looks basically like this: >> >> | id | year | question1 | question2 > | >> question3 | etc... >> | 5 | 1999 | 1 | 4 > | >> 3 | >> | 5 | 2001 | 3 | 4 > | >> 2 | >> | 6 | 1999 | 3 | 5 > | >> 4 | >> >> >> So ultimately I'd like a graph with question1, question2...questionX >> along the x-axis, and the median of each variable on the y-axis, with > a >> different line for each year. >> >> I feel like it should involve tabstat or reshape somehow, but can't >> manage to work it out. Any help appreciated. > > * > * 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/ * * 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: Graphing the median of a list of variables***From:*Jeremy Voros <jeremyvoros@gmail.com>

**st: RE: Graphing the median of a list of variables***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**Re: st: RE: Graphing the median of a list of variables***From:*Jeremy Voros <jeremyvoros@gmail.com>

**RE: st: RE: Graphing the median of a list of variables***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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