Table 20.3 Complete score-to-calibration table for tests based on whole sample

This Table, which must be selected explicitly with TFILE=, or as a subtable with "Request Subtable" on the "Output Tables" menu, shows an estimated item calibration for all possible rates of success by persons, i.e., the item measure corresponding to every observable proportion-correct-value or item marginal raw score for the entire sample. To select this Table, use "Request subtables" in the Output Tables menu,

 

Output Tables

Request Subtables

20.3

OK

 

or enter into your control file:

TFILE=*

20.3

*

 

TABLE OF ITEM MEASURES ON COMPLETE NON-EXTREME SAMPLE FOR TAP LIKE 4  1-3-4

----------------------------------------------------------------------------

| SCORE  MEASURE    S.E. | SCORE  MEASURE    S.E. | SCORE  MEASURE    S.E. |

|------------------------+------------------------+------------------------|

|     0     6.17E   1.87 |    12      .81     .45 |    24    -1.58     .48 |

|     1     4.84    1.08 |    13      .61     .44 |    25    -1.82     .50 |

|     2     3.98     .82 |    14      .41     .44 |    26    -2.08     .52 |

|     3     3.40     .70 |    15      .22     .44 |    27    -2.36     .54 |

|     4     2.96     .64 |    16      .03     .43 |    28    -2.67     .57 |

|     5     2.58     .59 |    17     -.16     .43 |    29    -3.01     .60 |

|     6     2.26     .55 |    18     -.34     .43 |    30    -3.40     .64 |

|     7     1.97     .53 |    19     -.53     .44 |    31    -3.85     .71 |

|     8     1.71     .50 |    20     -.73     .44 |    32    -4.43     .82 |

|     9     1.46     .49 |    21     -.93     .45 |    33    -5.29    1.08 |

|    10     1.23     .47 |    22    -1.14     .46 |    34    -6.61E   1.87 |

|    11     1.01     .46 |    23    -1.35     .47 |                        |

----------------------------------------------------------------------------

 

SCORE raw score on this item of a complete sample containing all calibrated persons. Table 20.3 shows the score-to-measure table for items with complete data. For items with missing data, this table does not apply.

MEASURE measure corresponding to score (user-scaled with UIMEAN=, USCALE=).

S.E. standard error of the measure.

The statistical information in an item estimate for the entire sample is (USCALE/S.E.)²

 

The real difficulty of an item is its difficulty relative to ...

the average difficulty of all the items

This is the Winsteps default

UIMEAN= 0

the average ability of all the persons

Specify:

UPMEAN= 0

a person who scores 50% on all the items in the test

a) Run a standard analysis

b) Output Table 20

c) In Table 20.1, look for the measure corresponding to 50% success on the test

d) Specify

UIMEAN = - (corresponding to 50% success on the test)

e) rerun the analysis

f) look at Table 20.1, 50% success on the test should be "0".

an item on which 50% of all the persons succeed

a) run a standard analysis

b) Menu: Output Tables

c) Click on first entry "Request Subtables"

20.3

Click on OK

c) In Table 20.3, look for the measure corresponding to 50% success by the sample

d) Specify

UIMEAN = - (corresponding to 50% success by the sample)

e) rerun the analysis

f) look again at Table 20.3, 50% success by the sample should be "0".


Help for Winsteps Rasch Measurement Software: www.winsteps.com. Author: John Michael Linacre

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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
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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