topic Re: Box Plots in Graphics Programming

Box Plots

llt34c — Fri, 29 Dec 2017 15:44:47 GMT

I have output my interactive means from the glimmix procedure of SAS and am trying to make box plots from these means. Please see the attached. I don't understand why they aren't coming through as box plots. See my code below. I am wanting to look and see if there are any outliers in this data set and thus, am wanting to visualize with box plots. Any suggestions?

Thanks!

Proc SGPlot data=Means;
Vbox Mu/ Category=ParityGrpStrat1 Group=Trt;
Run;

Re: Box Plots

WarrenKuhfeld — Fri, 29 Dec 2017 16:01:02 GMT

Try it once without group= and see if that is more what you had in mind. I have never tried group= and category= together. Do you have any variability within those groups?

Re: Box Plots

Cynthia_sas — Fri, 29 Dec 2017 16:08:24 GMT

Hi:

It was my understanding that the Box plot was doing the summarizing for you. For example, in the documentation about box plots:

SASHELP.PRDSALE is NOT pre-summarized. The VBOX statement causes the data to be summarized and the mean calculated.

Or, if I do this:

proc sgplot data=sashelp.iris;
  vbox sepallength / group=species;
run;

SASHELP.IRIS is not presummarized, the mean and outlier are shown based on the unsummarized data in the data set.

The things I might suggest are that you use your original dataset with the SGPLOT procedure step so that you see the distribution of your unsummarized data.

OR, PROC GLIMMIX has a PLOTS= option and will produce a Box plot using ODS GRAPHICS, so looking up the PLOTS= option might help you too.

Also, if you are just looking for outliers, PROC UNIVARIATE will show you the 5 highest and lowest (extreme obs) by default if you do this:

proc univariate data=sashelp.iris;
  var sepallength;
run;

cynthia

Re: Box Plots

llt34c — Fri, 29 Dec 2017 16:28:57 GMT

Thanks. This allowed me to see the box plots better for each "grouping" if you will. I plotted with the raw data and was successful. Just not sure why it wouldn't work the same with these means.

Thanks for your help!

Re: Box Plots

llt34c — Fri, 29 Dec 2017 16:29:45 GMT

Thanks for your help. I was able to successfully plot with the raw data. I am still not sure though why I can't with the means.

Thanks again!

Re: Box Plots

WarrenKuhfeld — Fri, 29 Dec 2017 16:31:12 GMT

Given your data, you are successfully plotting the means. You see the mean and the median, which are the same. That is all you provided to plot.