Re: st: Plot means with SD

["Roger B. Newson" <r.newson@imperial.ac.uk>]

Patricia didn't seem to specify what these means and SDs are going to be 
plotted against. However, users who want to plot means with SD bars, 
error bars or confidence limits (or even medians, interquartile ranges, 
minima and maxima) should probably use the -eclplot- package, 
downloadable from SSC. If Patricia is calculating means using the -mean- 
command, then the -parmest- package, also downloadable from SSC, can be 
used to create an output dataset with 1 observation per mean and data on 
the mean, standard error and confidence limits, which the user can then 
use to produce the plot. The -xcollapse- package can also be useful for 
this purpose, and can also be downloaded from SSC. All of these packages 
contain hypertext references to documents that explain how they can be 
used together to produce plots of the kind that Patricia wants.

Best wishes

Roger


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: r.newson@imperial.ac.uk
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

Opinions expressed are those of the author, not of the institution.

On 04/04/2012 11:53, David Hoaglin wrote:
> Patricia,
>
> Stepping back from the programming details, I wonder what the basic
> question is.  If the two variables come from the same patients, is
> medstable part of durofstay, and are you also looking at a scatterplot
> of medstable versus durofstay?
>
> Also, if those variables come from the same patients, and you are
> interested in the difference between the variables, it would be
> helpful to look at the difference for each patient (i.e., durofstay
> MINUS medstable), in order to free the comparison of differences among
> patients.
>
> If you had a something that resembles a boxplot, why would you want
> mean instead of median and, especially, SD instead of the quartiles?
> How skewed are the variables, especially durofstay?
>
> David Hoaglin
>
>
> > I have two variables
> > 1) medstable (days after a patient achieves medical stability, in days)
> > 2) durofstay    (duration of hospital stay; in days)
> >
> > now I wanna plot these two variables with mean and SD, so that I can see the differences of both.
> > How can I do this?
>
> *
> *   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/