Documentation Example 1 for PROC IRT
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: IRTEX1 */
/* TITLE: Documentation Example 1 for PROC IRT */
/* */
/* PRODUCT: STAT */
/* SYSTEM: ALL */
/* KEYS: */
/* PROCS: IRT */
/* DATA: */
/* */
/* SUPPORT: Xinming An */
/* REF: PROC IRT, EXAMPLE 1 */
/* MISC: */
/****************************************************************/
data IrtUni;
input item1-item8 @@;
datalines;
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;
ods graphics on;
proc irt data=IrtUni link=probit pinitial itemfit plots=ICC;
var item1-item8;
model item1-item4/resfunc=twop, item5-item8/resfunc=graded;
run;
ods graphics off;
data IrtSimu;
input item1-item25 @@;
datalines;
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1 1 1 1 1 1 1 1 0 0 1 1 1 0 1 1 1 1 1 1
;
proc irt data=IrtSimu link=probit;
var item1-item25;
ods output ParameterEstimates=ParmEst;
run;
data Diffs(keep=Item Difficulty);
set ParmEst;
Difficulty = Estimate;
if (Parameter = "Difficulty") then output;
run;
proc print data=Diffs;
run;
data Slopes(keep=Item Slope);
set ParmEst;
Slope = Estimate;
if (Parameter = "Slope") then output;
run;
proc print data=Slopes;
run;
proc sort data=Diffs;
by Difficulty;
run;
proc print data=Diffs;
run;
proc sort data=Slopes;
by Slope;
run;
proc print data=Slopes;
run;
proc sort data=Slopes;
by Item;
run;
proc sort data=Diffs;
by Item;
run;
data ItemEst;
merge Diffs Slopes;
by Item;
if Difficulty < -1.0 then DiffLevel = 1;
else if Difficulty < 0 then DiffLevel = 2;
else if Difficulty < 1 then DiffLevel = 3;
else DiffLevel = 4;
run;
proc print data=ItemEst;
run;
proc sort data=ItemEst;
by difflevel slope;
run;
proc print data=ItemEst;
run;