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IFILE= item output file |
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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.
IFILE=? opens a Browse window
"Status=-2 to -6" means that there are no measurable responses by those items in this analysis. The persons 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 |
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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 number |
7 |
14 |
MEASURE |
F8.2 |
2. Item's 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 measure (estimated using EXTRSC=) for extreme maximum raw score -1 = Extreme maximum measure (estimated using EXTRSC=) for extreme minimum raw score -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 |
25 |
COUNT |
F8.1 |
4. The number of responses used in calibrating (TOTAL=N) or the observed count (TOTAL=Y) |
26 |
34 |
SCORE |
F8.1 |
5. The raw score used in calibrating (TOTAL=N) or the observed score (TOTAL=Y) |
35 |
41 |
ERROR |
F7.2 |
6. Item calibration's standard error (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 |
PTME |
F7.2 |
12. Item by test-score correlation: point-biserial (PTBS) or point-measure |
84 |
90 |
WEIGHT |
F7.2 |
13. Item weightIWEIGHT= |
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 |
PTBIS, PTME |
F6.2 |
20. Item by test-score correlation: expected value. PTBIS= |
134 |
139 |
RMSR |
F6.2 |
21. Root-mean-square residual RMSR= |
140 |
140 |
|
1X |
Blank |
141 |
141 |
G |
A1 |
22. Grouping to which item belongs (G) ISGROUPS= |
142 |
142 |
|
1X |
Blank |
143 |
143 |
M |
A1 |
23. Model used for analysis (R=Rating, S=Success, F=Failure) MODELS= |
144 |
144 |
|
1X |
Blank |
145 |
145 |
R |
A1 |
24. Recoding/Rescoring indicator: "." = only CODES= "A" = ALPHANUM= "K" = KEY1= Others = IREFER= |
146 |
146 |
|
1X |
Blank |
147 |
176 |
NAME |
A30+ |
25. Item name or label |
The format descriptors are: |
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In = Integer field width n columns |
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Fn.m = Numeric field, n columns wide including n-m-1 integral places, a decimal point and m decimal places |
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An = Alphabetic field, n columns wide |
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nX = n blank columns. |
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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 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 |
ERROR |
F7.2 |
6. Item calibration's standard error (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 |
PTBS, PTME |
F7.2 |
12. Item by test-score correlation: point-biserial (or point-measure PTBIS= |
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 standard IFILE=
; ITEM Knox Cube Test (Best Test Design p.31) Nov 10 15:40 2005
;ENTRY MEASURE STTS COUNT SCORE ERROR IN.MSQ IN.ZSTD OUT.MS OUT.ZSTD DISPL PTME WEIGHT OBSMA EXPMA DISCR G M NAME
; 1 -6.74 -1 34.0 34.0 1.87 1.00 .00 1.00 .00 .00 .00 1.00 .0 .0 1.00 1 R 1= 1-4
4 -4.54 1 34.0 32.0 .82 .92 -.16 .35 -.24 .00 .55 1.00 94.1 94.1 1.07 1 R 4= 1-3-4