Selection: Several specifications require or allow the choice of columns in the item label, person label or data record. There are several formats:

 

Specification=

DGF=, DIF=, DPF=, EQFILE=, IAFILE=, IMAP=, IPMATRIX=, ISORT=, ISUBTOT=, IWEIGHT=, PAFILE=, PKMAP=, PMAP=, PSORT=, PSUBTOT=, PWEIGHT=, @Fieldname=

Specification=S...W...

Specification=S...E...

Specification=...-...

S or s is the starting column in the person or item label

W or w is the width in columns

E or e is the ending column in the label

- indicates the column range

DPF=$S1W1

DPF=S1W1

DPF=1W1

DPF=1

means "use the section of the item (or person) label starting in column 1 of the label with a width of 1 column".

DPF=$S3W2

DPF=S3W2

DPF=3W2

means "use the section of the item (or person) label starting in column 3 of the label with a width of 2 columns".

DPF=$S3E4

DPF=S3E4

DPF=3E4

DPF=3-4

means "use the section of the item (or person) label starting in column 3 of the label and ending in column 4".

Specification=C...W...

Specification=C...E...

Specification=c...w...

Specification=c...e...

C or c is the starting column in the item label or person data record

W or w is the width in columns

E or e is the ending column in the data record

This always works if the columns are within the person or item label. If the columns referenced are in the data record, but outside the person label, the information may not be available.

PWEIGHT = $C203W10

PWEIGHT = C203W10

PWEIGHT = C203E212

means "person weighting is in column 203 of the data record, with a width of 10 columns, ending in column 212"

Specification=$N

the person or item entry number is displayed

Specification = @Fieldname

selects one or a block of columns as specified by a prior @Fieldname= instruction

@AGE = 2E3

PSUBTOTAL = @AGE

the person's age is in columns 2 and 3 of the person label:

subtotal the persons by age classifier

Specification=MA3

Specification=MD2

M = Measure

A = Ascending or D = Descending

1 or higher integer: number of strata

 e.g., MA3 = Measures Ascending in 3 ability strata

Specification=FOMA3

Specification=FILD4

F = Fit, I = Infit, O = Outfit

M = Mean-square, L = Log-mean-square, S = t Standardized

A = Ascending or D = Descending

1 or higher integer: number of strata

 e.g., FILD2 = Fit - Infit - Log-scaled - Descending -2 fit strata

Strata: MA3, etc.

Strata are equally long divisions of the reported range of the statistic.

Stratum number for this value = Max(1+ Number of strata * (Current value - Lowest reported value)/(Highest reported value - Lowest reported value), Number of strata)

DIF=MA3

Table 30

PSUBTOTAL=MA3

Table 28

PMAP=MA3

Table 16

Non-uniform DIF for 3 ability strata

Output DIF Table

Person sub-total for same 3 ability strata

Output subtotal Table

Show ability strata on the person map

Output person map

Specification = selection + selection

+ signs can be used to concatenate selections

IMAP = 3-4 + 8W3

show in Table 12 columns 3, 4, 8, 9, 10 of the item label.

Specification = "..."

Specification = '...'

constants in quotes can be included with selection.

PMAP = 3 + "/" + 6

show in Table 15 column 3, a slash, and column 6 of the person label, e.g., F/3

 


Multiple-format specifications:


IAFILE = *

the item anchor values follow this specification in a list

IAFILE = 3-7

the item anchor values are in columns 3-7 of the item label

IAFILE = filename.txt

the item anchor values are in the file called "filename.txt"


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Rasch Publications
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
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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
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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

 

 

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