Example 18: Maximum size dataset

This demonstrates the maximum data set size which Winsteps can analyze: 9,999,999 persons (rows) and 64,000 items (columns). Here, 20MB responses. Maximum with this version of Winsteps is 2GB observed responses out of 640GB possible responses. Please email mike@winsteps.com if you need larger capacity.

 

; This control file is EXAM18.TXT

; 9,999,999 persons and 64,000 items: uses 160GB temporary disk storage

; this analysis takes 9+ hours

TITLE='Example 18: Demonstration of maximum size dataset in outline'

ITEM1=11; Responses start in column 11
NI=64000; maximum number of items
NAME1=1        ; start of person label

NAMELENGTH = 10 ; length of person label

CODES=01; dichotomous data

 

; FOR LARGE DATA SETS

CMLE=No        ; CMLE=Yes only works to about NI=300 items. Results of CMLE the same as JMLE from about NI=100 items
SUBSETS=No; only check for subsets once, if in doubt
DISTRACTORS=No; do distractors only in the final analysis run
MPROX=1        ; minimum PROX iterations
CONVERGE=B; set reasonable convergence limits
RCONV=0.1; this maximum residual is probably much too small - use Ctrl+F to stop JMLE iterations
LCONV=0.01; set at smallest visible logit change
; ESTMULT=; set this from the Diagnosis menu if changes in estimates are too small at each iteration

 

; Exam18.txt dataset is the outline of a 9,999,999 persons x 64,000 items dataset

; Exam18.txt has 20MB non-missing observations

;        | 1        18| 19-32000 |32001-64000|

;        -------------------------------------

; 1      | data below | 0......0 | 1........1|

; 35     | data below | 0        |          1|

; 36     | 0.........0           |          1|

; 5000000| 0                     |          1|

;        |-----------------------------------|

; 5000001| 1                     |          0|

; 9999999| 1...................1 | 0........0|

;        -------------------------------------

 

EDFILE=*

;     persons       items   responses

;     1-35          1-18    is dataset below

      1-35         19       0

     36             1-18    0      

      1            19-32000 0

      1         32001-63999 1

     36-5000000     1       0      

      1-5000000 64000       1

5000001-9999998     1       1

5000001-9999998 64000       0

9999999             1-32000 1

9999999         32001-64000 0

*

 

;PLFILE= no more person names in this demonstration file

;ILFILE= no more item names in this demonstration file

 

&END

Item 1 label

; no more item names in this demonstration file

END NAMES

Adam    M 111111100000000000

Anne    F 111111111100000000

Audrey  F 111111111100100000

Barbara F 111100100100000000

Bert    M 111110101100000000

Betty   F 111111111000000000

Blaise  M 111111111111100000

Brenda  F 111111111100000000

Britton F 111011111000000000

Carol   F 111100101000000000

David   M 111111111110100000

Don     M 111111111001000000

Dorothy F 111111111100000000

Elsie   F 111101111100000000

Frank   M 111000000000000000

Helen   F 111111111100000000

James   M 111111111110000000

Janet   F 111111111100000000

Joe     M 111110011111000000

Kim     F 111111111100100000

Linda   F 111011000000000000

Lisa    F 111111111100000000

Martha  F 111111111100000000

Mike    M 111111111111101000

Lud     M 111111001110010000

Richard M 111111100000000000

Rick    M 111111111010000000

Rod     M 111111111111000000

Ron     M 111111111110000000

Susan   F 111111111000000000

Thomas  M 111111111010000000

Tracie  F 111111111110100110

Walter  M 111111111101010000

William M 111111111110000000

Zula    F 111111111100110000

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