how to write code for 1 parameter logistic model ?

[CarsonGrey]

I have a test contains 150 items, item difficulty parameter for each item is as attached. Suppose I now have candidate whose ability level is 0, I named it theta=0. Now on each of the item, I need to calculate the probability of this candidate correctly answer on each of the time, how should I edit the following macro sas code to make it work?

proc import datafile="\bpar.csv"   dbms=csv out=bpar replace; run;

%macro f1;

do i=1 to 150;  /*from item 1 to item 150*/

prob &i= exp(theta-bpar&i)/(1+exp(theta-bpar&i);   /*1 parameter logistic regression model*/

end;

%mend;

%f1;

[FreelanceReinh]

Hello @CarsonGrey and welcome to the SAS Support Communities!

Please see @Reeza's reply to @superbug's identical question, posted three days ago: https://communities.sas.com/t5/SAS-Programming/how-to-write-code-for-1-parameter-logistic-model/m-p/...