A two-facet flat data file
Here is the data for the Knox Cube Test (KCT) from "Best Test Design" (Wright & Stone, 1978). The first 2 columns are the child number. The scored responses on the 18 items (1=correct, 0=incorrect) are in columns 4-21. There are 35 children altogether. These data are in file "KCTFDAT.txt":
1 111111100000000000 child 1, 18 dichotomous 0-1 responses
(and so on down to)
35 111000000000000000 Child 35
1 4 Columns
The keyword list (in file KCTFkey.txt, in the facform folder) converts the flat file into a Facets file:
; File: KCTFkey.txt comment for your information
; This converts a flat data file into a Facets file (Comments start with ;)
$Input = KCTFDAT.txt ; the flat file
$Output = KCTFFAC.txt ; the file of Facets-formatted data
$Facets = 2 ; two facets - children and tapping items
; labels for the facets
$Flabel = 1, "Children"
$Flabel = 2, "Tapping items"
; let's output the specifications that Facets needs:
$Spec = "Title = Knox Cube Test" these are explained in the Facets manual
$Spec = "Output = kctOUT.txt ;the Facets output file"
$Spec = "Models =?,?,D"
; person element number is child number in the flat file:
$Label = 1, $S1W2 ; Child number is column 1 of data, width 2
; reset item numbering
Itemnum = 1 ; define variable Itemnum with value 1. This will be the item number.
; now go across the line for 18 items
$Do = 18
$Label = 2, Itemnum ; Itemnum has the item number
; at this point the current element in facet 1 and in facet 2 have been
; identified by $Label= keywords
$Rating = $S(Itemnum+3)W1 ; first response: column 4 width 1.
; The reformatted rating is written to the $Output file.
Itemnum = Itemnum + 1 ; increment for next response
After running the following at the DOS prompt:
The Facets-format output file is KCTFFAC.txt:
; FACFORM Version No. 1.20, May 3, 1992
; Run on 05-03-1992 21:56:09
; from Keyword file: KCTFLATkey.txt
Facets = 2
Title = Knox Cube Test
Output = kctOUT.txt ;the Facets output file
| (31 more children numbers here)
1,1-18,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0 child 1, items 1-18, 18 responses
(and so on down to)
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|Rasch Measurement Transactions (free, online)||Rasch Measurement research papers (free, online)||Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch||Applying the Rasch Model 3rd. Ed., Bond & Fox||Best Test Design, Wright & Stone|
|Rating Scale Analysis, Wright & Masters||Introduction to Rasch Measurement, E. Smith & R. Smith||Introduction to Many-Facet Rasch Measurement, Thomas Eckes||Invariant Measurement with Raters and Rating Scales: Rasch Models for Rater-Mediated Assessments, George Engelhard, Jr. & Stefanie Wind||Statistical Analyses for Language Testers, Rita Green|
|Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar||Journal of Applied Measurement||Rasch models for measurement, David Andrich||Constructing Measures, Mark Wilson||Rasch Analysis in the Human Sciences, Boone, Stave, Yale|
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