Example 5: Scoring key for items and CAT responses

A multiple choice adaptive test, in file EXAM5.TXT with responses "a", "b", "c", "d" and a scoring key for 69 items. Your data are in the control file. This was administered as a CAT test, then the response file formatted into a "flat" file with one row per person and one column per item.

; This file is EXAM5.TXT

TITLE="An MCQ Test"        ; the title

NI=69                        ; 69 items

ITEM1=10                ; response string starts in column 10

NAME1=1                ; person-id starts in column 1

CODES=abcd                ; valid response codes

MISSCORE=-1                ; standard scoring of missing data, means that blanks are ignored

KEY1 = dcbbbbadbdcacacddabadbaaaccbddddcaadccccdbdcccbbdbcccbdcddbacaccbcddb

                       ; scoring key of correct answers

ITEM=TOPIC                ; items are topics

PERSON=STDNT                ; respondents are students

NAMLMP=2                ; first 2 characters on maps, e.g., nl

PFILE=EXAM5PF.TXT        ; write out person measures

CSV=Y                        ; separate values by commas in PFILE=

HLINES=N                ; write out no heading lines in PFILE=

; Many spreadsheets and statistics programs expect a file of numbers separated by commas.

; Use IFILE= or PFILE= with CSV=Y and HLINES=N.

MJMLE=0                ; allow as many JMLE iterations as necessary

EXTRSC=0.5                ; most conservative (central) extreme measures wanted

XFILE=EXAM5XF.TXT        ; write out individual response residual file

&END

nl01  Month

nl02  Sign

 .

sb02  newspaper

sb03  newspaper

END NAMES

IM  CAT                          a          dcacc  ccabbcaa

NM  KAT     b badad accaaba aa c dd   ab   c

  .

NH  RIC  ddb  b dbdcbcaadba ba acd bad  db     c   d    cc                  

IL  HOL        a      a  da d   d ccbddd bcd  dc ca