Data definition keywords
The number of facets which interact to make up each data observation.
e.g., when there are examinees, items and judges, then $Facets = 3
The number of a facet and its label in text format, e.g., $Flabel = 2, Subjects
You may optionally append control codes to be transferred to Facets,
e.g., to specify that this is an anchored facet, $Flabel = 1, Judges, A
Each line in the input data file ends with standard DOS Carriage Return-Line Feed codes. This is the usual format for DOS and ASCII files. It is the default.
$Length = number (fixed length data lines)
Each line is of the same fixed length, (number) bytes long. This is sometimes required for files imported from other computer systems in fixed-length record format. E.g., $Length = 100, for records 100 characters long.
Sometimes there are "invisible" codes, particularly at the end of each line. Adjust the record length up or down one or two to allow for them. For instance, there are two invisible codes, "Carriage Return" and "Line Feed" at the end of each line in a DOS text file.
To verify that your $Length= instruction is correct, use a short keyword file such as:
$Input=lengthDAT.txt your data file
$Output=testOUT.txt a dummy output file
$Length=20 your best data file
$Facets=2 a dummy number of facets
$Print=$s1w5 the first five characters of each data record display on your screen.
Check that the 5 characters displayed on your screen are the first five characters of each record. If not, the $Length= value needs adjustment.
[, "anchor value+","+"group"]
(number/name of element)
defines the current element in the facet referenced by (facet number).
(facet number) is the number of the facet to which the current element belongs.
(element number) is the number of thee current element in the facet
(element name) is the descriptive identifying text label for the current element.
E.g., facet 2 references Items. Element 7, "Multiplication", is the current element in facet 2: $Label = 2, 7, Multiplication
Either the element number or its name or both can be specified. If no number is given, then Facform will assign one.
"anchor value" is the logit anchor value (if any)
"group" is the element"s group number (if any)
E.g., an element with an anchor value of 2.35 logits:
$Label = 4,,Zoo,2.35
An element with anchor value of 0.0 in group 6
$Label = 5,13,,"0.0,6"
An element with no anchor value, belonging to Group given by variable sex.
sex =2 ;male
$Label = 1,,Fred,","+Q(sex)
This causes the specified observation, rating or counter to be written in Facets format into the $Output file. Blank ratings are bypassed, and not written into the $Output file. E.g., for a rating of 2 on a scale, $Rating=2
When there are identical replications of the same datum value with the exact same facets and element numbers, their number can be specified. E.g., for 103 ratings of 4 with the same facets and element numbers, $Rating=4,102
Replications with a count of 0 are treated as missing data and ignored. E.g., $rating=2,0
This is useful for entering tabular or survey data.
Observations records as decimals, e.g., 2.5, 1.23, must be transformed into integer values.
data are 0.00 0.25 0.50 0.75 1.00 etc.
$rating = $N($S1W4)*4
data are in the range 1.00 to 9.99
since Facets understands data in the range 0 to 255, a valid transformation is:
$rating = $I(($N($S1W4)-1) * 28)
This gives ratings in the range 0 to 252.
Help for Facform Rasch Measurement Software: www.winsteps.com. Author: John Michael Linacre
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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|
|in Spanish:||Análisis de Rasch para todos, Agustín Tristán||Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez|
|Winsteps Tutorials||Facets Tutorials||Rasch Discussion Groups|
|Coming Winsteps & Facets Events|
|May 22 - 24, 2018, Tues.-Thur.||EALTA 2018 pre-conference workshop (Introduction to Rasch measurement using WINSTEPS and FACETS, Thomas Eckes & Frank Weiss-Motz), https://ealta2018.testdaf.de|
|May 25 - June 22, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|June 27 - 29, 2018, Wed.-Fri.||Measurement at the Crossroads: History, philosophy and sociology of measurement, Paris, France., https://measurement2018.sciencesconf.org|
|June 29 - July 27, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|July 25 - July 27, 2018, Wed.-Fri.||Pacific-Rim Objective Measurement Symposium (PROMS), (Preconference workshops July 23-24, 2018) Fudan University, Shanghai, China "Applying Rasch Measurement in Language Assessment and across the Human Sciences" www.promsociety.org|
|Aug. 10 - Sept. 7, 2018, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com|
|Oct. 12 - Nov. 9, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|John "Mike" L.'s Wellness Report:
I'm 72, take no medications and, March 2018, my doctor is annoyed with me - I'm too healthy!|
According to Wikipedia, the human body requires about 30 minerals, maybe more. There are 60 naturally-occurring minerals in the liquid Mineral Supplement which I take daily.