topic Re: How to change y axis scale in boxplot ? in New SAS User

How to change y axis scale in boxplot ?

Aline1610 — Tue, 27 Jul 2021 19:57:29 GMT

Hello,

I need to display a boxplot of a quantitative variable (Y) according to a binary variable (X) so i used this code :

PROC SGPLOT DATA=LNH; 
vbox Y/category=X; 
RUN;

But the boxplot is not readable ; the y axis scale is not appropriate since my quantitative variable has very small values :

Median = 5.20*10^-8;

Q1 (25%)= 4.02*10-9;

Q3 (75%)=3.12*10^-7 ;

Mininum value=0;

Maximum value=5.77*10^-4;

How can I change the y axis scale to get a relevant boxplot ?

Thank you in advance for your help !

Re: How to change y axis scale in boxplot ?

ballardw — Tue, 27 Jul 2021 19:40:38 GMT

Try adding a

yaxis values=(0 to 6E-4 by 1E-4); if you expect to display the maximum value, which likely won't show much of a box.

yaxis values=(0 to 5E-7 by 1E-7); to show the IQR but will trim out the larger values.

OR use a logarithmic axis

And possibly increase the size of the graphic area a bunch. Like at least 12 inches tall or 320CM.

The IQR is so small that you may still not see things because the thickness of the lines may be larger that values.

Re: How to change y axis scale in boxplot ?

Aline1610 — Tue, 27 Jul 2021 19:52:53 GMT

Thank you for your reply !

Ok i will try these points but can you please tell me where exactly should i put yaxis values=(0 to 6E-4 by 1E-4) in my code cause it gave me errors.

And what is the code to use a logarithmic axis ?

Re: How to change y axis scale in boxplot ?

Reeza — Tue, 27 Jul 2021 19:56:33 GMT

The YAXIS is a statement on it's own.
Look at the options within the statement (hint = TYPE) for how to set your axis as logarithmic.
https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/grstatproc/n0n6uml63c6h8dn16phbd1arm9g9.htm

Re: How to change y axis scale in boxplot ?

ballardw — Tue, 27 Jul 2021 19:59:34 GMT

Please note that my example included the ; to end the statement.

When you get errors copy the entire procedure code from the log, open a text box on the forum with the </> icon, then paste the copied text in the box. Include the entire procedure and all of the messages, not just the error.

Re: How to change y axis scale in boxplot ?

Aline1610 — Tue, 27 Jul 2021 20:01:38 GMT

Ok thank u it's clearer

Re: How to change y axis scale in boxplot ?

Aline1610 — Tue, 27 Jul 2021 20:03:14 GMT

Thank you for the link it will help me !