Error Message for IRT Model

[anavipalma]

 Hi!!!

I am using this data set

record_id	frequency1	success2	reliable3	discussion4	contribution5
A	3	2	3	3	9
B	4	2	2	2	14
C	3	3	3	3	9
D	4	2	3	3	7
E	5	4	4	4	14
F	5	4	4	4	2
G	3	3	4	3	14
H	5	3	4	3	14
I	3	4	4	4	5
J	5	4	4	4	14
K	4	2	2	2	14
L	4	2	2	2	14
M	3	4	4	4	1
N	3	4	4	4	11
O	3	4	4	4	9
P	5	4	4	4	2
Q	4	4	4	4	9
R	6	4	4	4	3
S	3	3	3	3	5
T	2	4	3	3	9

I wan to have these results

But I obtain the following message in the log:

Tried really hard to come up with a solution, no success. Thank you for your help, very much appreciated!

Ana

[FreelanceReinh · Accepted solution]

Hi @anavipalma and welcome to the SAS Support Communities (as a first-time poster)!

I have never worked with PROC IRT in practice, but the error message is not specific to this procedure. It just reminds you that the syntax for a name range list uses the double hyphen:

frequency1--contribution5

The single hyphen is used in numbered range lists, which require the numbered variables to have the same "root" (such as "item" in item1-item5).

For the polychoric correlation heat map you need to use the syntax in line 76 of your log (with the two plot requests in parentheses) or a second plots= option. Otherwise, the second polychoric option is not interpreted as part of the plots= option. The itemfit option only applies to binary responses (i.e., variables with only two levels).

Hint: It's better to include SAS code or logs as text (using the "Insert SAS Code" [running-man icon] or "Insert Code" [</> icon] button of the message window, respectively), not as pictures, because then we can copy the code into our SAS sessions.

[anavipalma]

Thank you so much!

Really appreciate it!

I learned a lot today!