11-13-2011 11:04 AM
I'd like to use boxplot to make comparisons between three variables, say, Nh, Nt, Nc. I'd like to see the three boxplots side by side in the order: Nh, Nt, Nc. But the output displayed the boxplots in the order: Nc, Nh, Nt (alphabetically). How can I change the order to the one I want? Thanks!
11-13-2011 01:17 PM
With the SGPLOT procedure (SAS 9.2), you can set DISCRETEORDER=data on the XAXIS statement to get data order.
data box; do x='Nh', 'Nt', 'Nc'; do i=1 to 10; y=10*ranuni(2); output; end; end; run; ods listing; ods graphics / reset width=5in height=3in imagename='BoxOrder'; proc sgplot data=box; vbox y / category=x; xaxis display=(nolabel) discreteorder=data; run;
11-13-2011 02:29 PM
Sorry I didn't make it clear. First, I'd like to use proc boxplot. Second, I'd like to control the order of the boxes in the boxplots. Not necessarily Nh, Nt, Nc, but maybe Nt, Nc, Nh. Would you please tell me how to do that using proc boxplot? Thanks.
11-13-2011 06:33 PM
You could manipulate your data so that the values of your boxes are in alphabetical order, and then create a format so that what displays is still the meaningful names, like 'Nt', 'Nc', and 'Nh'. For example:
do x='V3', 'V1', 'V2';
do i=1 to 10;
'V1' = 'Nt'
'V2' = 'Nc'
'V3' = 'Nh';
proc sort data=box;
ods graphics / reset width=5in height=3in imagename='BoxOrder';
proc boxplot data=box;
format x $myboxval.;
11-13-2011 10:04 PM
In the existing data set, the order is Nh, Nt, Nc. I know in proc freq, one can use "order=data" but not in proc boxplot. I don't want to restructure the data set. How can I solve the problem?
11-14-2011 02:14 AM
You can pad white blank before value of variables to customize your order.
Make sure that your variable has long enough to hold these white blanks.
data box; length x $ 8; do x='Nt', 'Nc', 'Nh'; do i=1 to 10; y=10*ranuni(2); output; end; end; run; data box; set box; if x='Nt' then x=' Nt'; else x='Nc' then x=' Nc'; run; ods listing; ods graphics / reset width=5in height=3in imagename='BoxOrder'; footnote ''; proc boxplot data=box; plot y*x=i; run;
11-14-2011 08:35 AM
Add a dummy variable to the data set that has the values 1, 2, ...,k, where k is the number of categories. Then use a user-defined format as shown by
@Joeldw to map the dummy variable to the categorical values.