BookmarkSubscribeRSS Feed
lboyd
Calcite | Level 5

I am running:

ods graphics on;
proc irt data=ff1 RESFUNC=graded plots=iic;
   var fv_preptime    fv_fresh    fv_prepknow    fv_filling    fv_restarauntserv    fv_sugar    fv_dontlook    fv_costtoomuch;     
run;
ods graphics off;

 

on data that has 5 categories (ie. never, rarely, neutral, often, and always).  I am trying to get IIC plots, not ICC plots, but I keep getting an error:

NOTE: The IRT procedure is experimental in this release of the SAS system.
103  proc irt data=ff1 RESFUNC=graded plots=iic;
                                            ---
                                            1
WARNING 1-322: Assuming the symbol ICC was misspelled as iic.

 

I have run it other ways including plots=all, plots=(scree(unpack) iic) and I just can't seem to get the IIC plots.

Any suggestions?

Thanks!

 

5 REPLIES 5
Rick_SAS
SAS Super FREQ

Try it on a simple example. Perhaps there is something degenerate about your data:

 

data IrtUni;
   input item1-item8 @@;
   datalines;
1 0 0 0 1 1 2 1 1 1 1 1 1 3 3 3 0 1 0 0 1 1 1 1 1 0 0 1 0 1 2 3 0 0 0
0 0 1 1 1 1 0 0 1 0 1 3 3 0 0 0 0 0 1 1 3 0 0 1 0 0 1 2 2 0 1 0 0 1 1
3 3 0 1 0 0 1 2 2 1 
; 

proc irt data=IrtUni plots=ICC;
   var item1-item8;
run;
lboyd
Calcite | Level 5

Hi Rick,

Thank you for your response!  I just ran what you posted and changed plots=IIC and I still got this error:

237  proc irt data=IrtUni plots=IIC;
                                ---
                                1
WARNING 1-322: Assuming the symbol ICC was misspelled as IIC.

 

Any other thoughts as to why it doesn't like IIC?

 

My data is 5 categories (strongly agree=1, agree=2, neutral=3, disagree=4, and stronlgy disagree=5).

 

Thank you!

 

Rick_SAS
SAS Super FREQ

The IIC plot was introduced in SAS/STAT 13.2.  (13.2 = SAS 9.4m2) I conjecture that you are running 13.1 and so that plot is not available.  You can check your SAS version by using

 

%put SYSVLONG = &SYSVLONG;

lboyd
Calcite | Level 5

I have SYSVLONG = 9.04.01M1P120413

Rick_SAS
SAS Super FREQ

Right, and the M1 means you are running SAS 9.4m1 = SAS/STAT 13.1.  There have been three releases of SAS since then (13.2, 14.1, and 14.2).

SAS INNOVATE 2024

innovate-wordmarks-white-horiz.png

SAS is headed back 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.

Interested in speaking? Content from our attendees is one of the reasons that makes SAS Innovate such a special event!

Submit your idea!

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
  • 5 replies
  • 876 views
  • 0 likes
  • 2 in conversation