BookmarkSubscribeRSS Feed
🔒 This topic is solved and locked. Need further help from the community? Please sign in and ask a new question.
alexgouv
Obsidian | Level 7

Hi all,

 

I am trying to work on an ensemble model, one of which being an auto regressive model. I have a grouping variable(ID) and I am not sure what the difference is between the Class and By statements for this proc. I have only been able to find information on the difference in other procs(a lot of proc means).

 

If someone could explain how the class statement would effect my output that would be great!

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
PGStats
Opal | Level 21

The class statement has the same role in all regression procs.

 

A CLASS statement declares a categorical variable for use in your model. Parameters will be fitted for each level of the class variable.

 

A BY statement fits as many models as there are by-levels. It is a shortcut to submitting the proc for every level of the by-variable.

 

by sex;

model weight = height;

 

fits two models with separate slopes and interceps.

 

class sex;

model weight = sex height;

 

fits a single model with two interceps and a single slope.

 

hth

PG

View solution in original post

1 REPLY 1
PGStats
Opal | Level 21

The class statement has the same role in all regression procs.

 

A CLASS statement declares a categorical variable for use in your model. Parameters will be fitted for each level of the class variable.

 

A BY statement fits as many models as there are by-levels. It is a shortcut to submitting the proc for every level of the by-variable.

 

by sex;

model weight = height;

 

fits two models with separate slopes and interceps.

 

class sex;

model weight = sex height;

 

fits a single model with two interceps and a single slope.

 

hth

PG

SAS INNOVATE 2024

Innovate_SAS_Blue.png

Registration is open! SAS is returning to Vegas for an AI and analytics experience like no other! Whether you're an executive, manager, end user or SAS partner, SAS Innovate is designed for everyone on your team. Register for just $495 by 12/31/2023.

If you are interested in speaking, there is still time to submit a session idea. More details are posted on the website. 

Register now!

What is Bayesian Analysis?

Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.

Find more tutorials on the SAS Users YouTube channel.

Get the $99 certification deal.jpg

 

 

Back in the Classroom!

Select SAS Training centers are offering in-person courses. View upcoming courses for:

View all other training opportunities.

Discussion stats
  • 1 reply
  • 433 views
  • 1 like
  • 2 in conversation