These commands perform special functions which enable Facform to obtain and decode the input file of raw data.
"Alphabetize": means convert to UPPER-CASE characters, between quotation marks, the expression ????, whether or not it is already in quotes, e.g., $A("New York") becomes "NEW YORK".
"Comma-separated value": means read the nnn"th comma-separated value from the current data record into a quoted character variable,
e.g., if the data record is 12,34,56,43, then $C2 is "34".
By default, the separating character is ",". Change this with $Separator=.
For Tab separators, use $T
"Group": means the current line-group number. The line-group number advances each time the keyword list is restarted. This is the same as $L unless $Nextline appears in the keyword list. When $Nextline is processed, $L advances by 1, but $G does not change. This can be used to identify examinees in the raw data file, e.g.,
$Label=1,$G ; Facet 1 is examinees, line-group number is the examinee number
Y=$G ; assigns the current line-group number to variable Y.
"Integer": means convert the expression represented by ???? to the nearest integer value. Values ending in 0.5 evaluate to the next larger value in absolute size. $I12.49 evaluates to 12. $I12.5 evaluates to 13. $I(-12.5) evaluates to -13.
The expression may be in numeric or character format. For character expression, only leading digits are evaluated. $I"23abcd" evaluates to 23. $I"AB12" evaluates to 0.
"Line": means the current line number in the input file of raw data file. This is useful when you wish to identify anomalies in the raw data file. E.g.,
$Print "Unexpected value of "+DATUM+" in line "+$Q($L)
"Number": means convert the expression represented by ???? to a number. If the expression is already a number, it is unchanged. If it is a character expression, then the leading digits are evaluated. E.g., $N"23.4abcd" evaluates to 23.4
"Quote": means convert to characters, between quotation marks, the expression ????. If ???? is already a quoted character value, it is unchanged. Otherwise ???? is converted to characters and placed between "". E.g., $Q(2+3) becomes "5".
"Start-End": means read the characters from the current data record, starting in position xx and ending in position yy as a quoted character variable.
E.g., if the data record contains ABCDEF starting in column 1, then $S2E4 yields "BCD".
"Start-Width": means read the characters from the current data record, starting in position xx with a width of ww, as a quoted character variable.
E.g., if the data record contains ABCDEF starting in column 1, then $S3W2 yields "CD".
"Tab-separated value": means read the nnn"th Tab-separated value from the current data record into a quoted character variable,
e.g., if the data record is 12[Tab] 34[Tab] 56[Tab] 43, then $T2 is "34".
"Unquote": means remove the quotes from around the value ???? if there are any. This can be used to convert a character string into a variable name. e.g., $U"AB" is the variable name AB.
Help for Facform Rasch Measurement Software: www.winsteps.com. Author: John Michael Linacre
For more information, contact firstname.lastname@example.org or use the Contact Form
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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 Rasch-related Events|
|Jan. 5 - Feb. 2, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|Jan. 10-16, 2018, Wed.-Tues.||In-person workshop: Advanced Course in Rasch Measurement Theory and the application of RUMM2030, Perth, Australia (D. Andrich), Announcement|
|Jan. 17-19, 2018, Wed.-Fri.||Rasch Conference: Seventh International Conference on Probabilistic Models for Measurement, Matilda Bay Club, Perth, Australia, Website|
|Jan. 22-24, 2018, Mon-Wed.||In-person workshop: Rasch Measurement for Everybody en español (A. Tristan, Winsteps), San Luis Potosi, Mexico. www.ieia.com.mx|
|April 10-12, 2018, Tues.-Thurs.||Rasch Conference: IOMW, New York, NY, www.iomw.org|
|April 13-17, 2018, Fri.-Tues.||AERA, New York, NY, www.aera.net|
|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|
|Sept. 3 - 6, 2018, Mon.-Thurs.||IMEKO World Congress, Belfast, Northern Ireland www.imeko2018.org|
|Oct. 12 - Nov. 9, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
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