Data definition keywords |
$Facets = number (number of facets in data)
The number of facets which interact to make up each data observation.
e.g., when there are examinees, items and judges, then $Facets = 3
$Flabel = number,name [,codes] (name of facet)
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
$Length = 0 (standard DOS input data lines)
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.
$Label = facet number [, element number] [, element name]
[, "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)
$Rating = number [, replications] (datum value)
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.
Decimal observations:
Observations records as decimals, e.g., 2.5, 1.23, must be transformed into integer values.
Examples:
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
Facets Rasch measurement software.
Buy for $149. & site licenses.
Freeware student/evaluation Minifac download Winsteps Rasch measurement software. Buy for $149. & site licenses. Freeware student/evaluation Ministep download |
---|
Forum: | Rasch Measurement Forum to discuss any Rasch-related topic |
---|
Questions, Suggestions? Want to update Winsteps or Facets? Please email Mike Linacre, author of Winsteps mike@winsteps.com |
---|
State-of-the-art : single-user and site licenses : free student/evaluation versions : download immediately : instructional PDFs : user forum : assistance by email : bugs fixed fast : free update eligibility : backwards compatible : money back if not satisfied Rasch, Winsteps, Facets online Tutorials |
---|
Coming Rasch-related Events | |
---|---|
May 17 - June 21, 2024, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
June 12 - 14, 2024, Wed.-Fri. | 1st Scandinavian Applied Measurement Conference, Kristianstad University, Kristianstad, Sweden http://www.hkr.se/samc2024 |
June 21 - July 19, 2024, Fri.-Fri. | On-line workshop: Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com |
Aug. 5 - Aug. 6, 2024, Fri.-Fri. | 2024 Inaugural Conference of the Society for the Study of Measurement (Berkeley, CA), Call for Proposals |
Aug. 9 - Sept. 6, 2024, Fri.-Fri. | On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com |
Oct. 4 - Nov. 8, 2024, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
Jan. 17 - Feb. 21, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
May 16 - June 20, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
June 20 - July 18, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Further Topics (E. Smith, Facets), www.statistics.com |
Oct. 3 - Nov. 7, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
Our current URL is www.winsteps.com
Winsteps® is a registered trademark