IFILE= item output file

IFILE=filename produces an output file containing the information for each item. This file contains 4 heading lines (unless HLINES=N), followed by one line for each item containing the following fields and the standard field selection. To change the output-field selection, go to the Output File dialog, IFILE=, Field selection, Make default., or IOFSFIELDS=.

IFILE=? opens a Browse window

 

"Status=-2 to -6" means that there are no measurable responses by those items in this analysis. The items may be listed in the IFILE= and in Table 14, but all the numbers shown are default values. They have no meaning. Please do not include those items in summary statistics.

 

Columns:

with "Select All Fields" using Output File Field Selection

Start

End

Label

Format

Description

1

1

 

A1

Blank or ";" if HLINES=Y and there are no responses or deleted or extreme (status: 0,-1, -2, -3)

2

6

ENTRY

I5

1. The item sequence entry number

7

14

MEASURE

F8.2

2. Item's MLE estimated difficulty calibration user-rescaled by UMEAN=, USCALE=, UDECIM=

15

17

STATUS

I3

3. The item's status:

2 = Anchored (fixed) measure

1 = Estimated measure

0 = Extreme maximum measure (estimated using EXTRSC=) for extreme minimum raw score

-1 = Extreme minimum measure (estimated using EXTRSC=) for extreme maximum raw score (usually 0)

-2 = No responses available for measure

-3 = Deleted by user. PDELETE=, PDFILE=, IDELETE=, IDFILE=, PSELECT=, ISELECT=

-4 = Inestimable: high (all responses in the same category with ISGROUPS=0 or CUTHI=)

-5 = Inestimable: low (all responses in the same category with ISGROUPS=0 or CUTLO=)

-6 = Anchored (fixed) measure with extreme (minimum or maximum) observed raw score

-7 to -16 = Temporarily deselected by Specification box with iSELECT= (usual STATUS - 10)

-17 to -26 = Temporarily deleted by Specification box with IDELETE= (usual STATUS - 20)

-27 to -36 = Temporarily deselected and deleted by Specification box with iSELECT= and iDELETE= (usual STATUS - 30)

18

25

COUNT

F8.1

4. The number of responses used in calibrating (TOTAL=N) or the observed count (TOTAL=Y)

26

34

SCORE

F9.1

5. The raw score used in calibrating (TOTAL=N) or the observed score (TOTAL=Y)

35

41

MODLSE

REALSE

F7.2

6. Standard error of the MLE or WLE item difficulty estimate adjusted by REALSE= and user-rescaled by USCALE=, UDECIM=

42

48

IN.MSQ

F7.2

7. Item infit: mean square infit

49

55

ZSTD, ZEMP, LOG

F7.2

8. Item infit: t standardized, locally t standardized, or log-scaled (LOCAL=)

56

62

OUT.MS

F7.2

9. Item outfit: mean square outfit

63

69

ZSTD, ZEMP, LOG

F7.2

10. Item outfit: t standardized, locally t standardized, or log-scaled (LOCAL=)

70

76

DISPLACE

F7.2

11. Item displacement (user-rescaled by USCALE=, UDECIM=)

77

83

PBSA

PBSX

PTMA

PTMX

F7.2

12. Item by test-score correlation: point-biserial or point-measure. PTBIS=

PBSA = Point-Biserial correlation including all responses in the raw score

PBSX = Point-Biserial correlation excluding the current item's response from the raw score

PTMA = Point-Measure correlation including all responses for the measure

PTMX = Point-Biserial excluding the current item's response from the measure

84

90

WEIGHT

F7.2

13. Item weight IWEIGHT=

91

96

OBSMA

F6.1

14. Observed percent of observations matching prediction

97

102

EXPMA

F6.1

15. Expected percent of observations matching prediction

103

109

DISCRIM

F7.2

16. Item discrimination (this is not a parameter estimate, merely a descriptive statistic) DISCRIM=

110

115

LOWER

F6.2

17. Item lower asymptote: ASYMPTOTE=Yes

116

121

UPPER

F6.2

18. Item upper asymptote: ASYMPTOTE=Yes

122

127

PVALU

F6.2

19. Item proportion-correct-values or average ratings: PVALUE=Yes:

128

133

PBA-E

PBX-E

PMA-E

PMX-E

F6.2

20. Expected value of Item by test-score correlation. PTBIS=

PBA-E = Expected value of Point-Biserial including all responses in the raw score

PBX-E = Expected value of Point-Biserial excluding the current response from the raw score

PMA-E = Expected value of Point-Measure including all responses in the measure

PMX-E = Expected value of Point-Biserial excluding the current response from the measure

134

139

RMSR

F6.2

21. Root-mean-square residual RMSR=

140

147

WMLE

F8.2

22. Warm's (Weighted) Mean Likelihood Estimate (WLE) of Item Difficulty user-rescaled by UMEAN=, USCALE=, UDECIM=

148

148

 

1X

 Blank

149

149

G

A1

23. Grouping to which item belongs (G) ISGROUPS=

150

150

 

1X

 Blank

151

151

M

A1

24. Model used for analysis (R=Rating, S=Success, F=Failure) MODELS=

152

152

 

1X

 Blank

153

153

R

A1

25. Recoding/Rescoring indicator:

"." = only CODES=

"A" = ALPHANUM=

"K" = KEY1=

"N" = RESCORE=2 and NEWSCORE=

"1" = RESCORE=1 and NEWSCORE=

Others = IREFER=

154

154

 

1X

 Blank

155

184

NAME

A30+

26. Item name or label: use ILFILE= for different item names

 

The format descriptors are:


In = Integer field width n columns


Fn.m = Numeric field, n columns wide including n-m-1 integral places, a decimal point and m decimal places


An = Alphabetic field, n columns wide


nX = n blank columns.

 

When CSV=Y, commas separate the values, which are squeezed together without spaces between. Quotation marks surround the "Item name", e.g., 1,2,3,4,"Name". When CSV=T, the commas are replaced by tab characters.

 

Example: You wish to write a file on disk called "ITEM.CAL" containing the item statistics for use in updating your item bank, with values separated by commas:

  IFILE=ITEM.CAL

  CSV=Y

 

When W300=Yes, then this is produced in Winsteps 3.00, 1/1/2000, format:

 

Columns:

 

Start

End

Label

Format

Description

1

1

 

A1

Blank or ";" if HLINES=Y and there are no responses or deleted (status = -2, -3)

2

6

ENTRY

I5

1. The item sequence number

7

14

MEASURE

F8.2

2. Item's MLE estimated calibration (user-rescaled by UMEAN=, USCALE=, UDECIM)

15

17

STATUS

I3

3. The item's status:

3 = Anchored (fixed) measure with extreme (minimum or maximum) observed raw score

2 = Anchored (fixed) measure

1 = Estimated measure

0 = Extreme minimum (estimated using EXTRSC=)

-1 = Extreme maximum (estimated using EXTRSC=)

-2 = No responses available for measure

-3 = Deleted by user

-4 = Inestimable: high (all responses in the same category with ISGROUPS=0 or CUTHI=)

-5 = Inestimable: low (all responses in the same category with ISGROUPS=0 or CUTLO=)

-6 = Deselected

18

23

COUNT

I6

4. The number of responses used in calibrating (TOTAL=N) or the observed count (TOTAL=Y)

24

30

SCORE

I6

5. The raw score used in calibrating (TOTAL=N) or the observed score (TOTAL=Y)

31

37

MODLSE

REALSE

F7.2

6. Item calibration's standard error with REALSE= and user-rescaled by USCALE=, UDECIM=

38

44

IN.MSQ

F7.2

7. Item mean square infit

45

51

ZSTD, ZEMP, LOG

F7.2

8. Item infit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)

52

58

OUT.MS

F7.2

9. Item mean square outfit

59

65

ZSTD, ZEMP, LOG

F7.2

10. Item outfit:t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)

66

72

DISPLACE

F7.2

11. Item displacement (user-rescaled by USCALE=, UDECIM=)

73

79

PBSA

PBSX

PTMA

PTMX

F7.2

12. Item by test-score correlation: point-biserial or point-measure. PTBIS=

PBSA = Point-Biserial correlation including all responses in the raw score

PBSX = Point-Biserial correlation excluding the current item's response from the raw score

PTMA = Point-Measure correlation including all responses for the measure

PTMX = Point-Biserial excluding the current item's response from the measure

80

80

 

1X

15. Blank

81

81

G

A1

16. Grouping to which item belongs, ISGROUPS=

82

82

 

1X

17. Blank

83

83

M

A1

18. Model used for analysis (R=Rating, S=Success, F=Failure) MODELS=

84

84

 

1X

19. Blank

85

132+

NAME

A30+

18. Item name

 

Example of IFILE= (to see other fields: Output File dialog)

 

; ACT  LIKING FOR SCIENCE (Wright & Masters p.18)  Aug  8 22:17 2013

;ENTRY MEASURE ST   COUNT    SCORE MODLSE IN.MSQ IN.ZST OUT.MS OUT.ZS  DISPL   PBSA WEIGHT OBSMA EXPMA DISCRM LOWER UPPER PVALU PBA-E  RMSR    WMLE G M R NAME

     1    -.40  1    75.0    109.0    .21    .55  -3.48    .49  -2.53    .00    .69   1.00  77.0  61.7   1.52   .00  2.00  1.45   .53   .42    -.39 1 R . Watch birds

     2    -.71  1    75.0    116.0    .22    .93   -.39    .72  -1.02    .00    .66   1.00  74.3  64.4   1.26   .00  2.00  1.55   .50   .52    -.70 1 R . Read books on animals


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