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.

"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
Start	End	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	I5	1. The item sequence number (ENTRY)
7	14	F8.2	2. Item's calibration (user-rescaled by UMEAN=, USCALE=, UDECIM=) (MEASURE)
15	17	I3	3. The item's status (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	F8.1	4. The number of responses used in calibrating (COUNT) or the observed count (TOTAL=Y)
26	34	F8.1	5. The raw score used in calibrating (SCORE) or the observed score (TOTAL=Y)
35	41	F7.2	6. Item calibration's standard error (user-rescaled by USCALE=, UDECIM=) (ERROR)
42	48	F7.2	7. Item infit: mean square infit (IN.MSQ)
49	55	F7.2	8. Item infit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
56	62	F7.2	9. Item outfit: mean square outfit (OUT.MS)
63	69	F7.2	10. Item outfit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
70	76	F7.2	11. Item displacement (user-rescaled by USCALE=, UDECIM=) (DISPLACE)
77	83	F7.2	12. Item by test-score correlation: point-biserial (PTBS) or point-measure (PTME)
84	90	F7.2	13. Item weight (WEIGHT)
91	96	F6.1	14. Observed percent of observations matching prediction (OBSMA)
97	102	F6.1	15. Expected percent of observations matching prediction (EXPMA)
103	109	F7.2	16. Item discrimination (this is not a parameter, merely a descriptive statistic)
110	115	F6.2	17. Item lower asymptote (LOWER): ASYMPTOTE=Yes
116	121	F6.2	18. Item upper asymptote(UPPER): ASYMPTOTE=Yes
122	127	F6.2	19. Item proportion-correct-values or average ratings (PROPCORR): PVALUE=Yes:
128	133	F6.2	20. Item by test-score correlation: expected value
134	139	F6.2	21. Root-mean-square residual
140	140	1X	Blank
141	141	A1	22. Grouping to which item belongs (G)
142	142	1X	Blank
143	143	A1	23. Model used for analysis (R=Rating, S=Success, F=Failure) (M)
144	144	1X	Blank
145	145	A1	24. Recoding/Rescoring indicator: "." = only CODES= "A" = ALPHANUM= "K" = KEY1= "N" = RESCORE=2 and NEWSCORE= "1" = RESCORE=1 and NEWSCORE= Others = IREFER=
146	146	1X	Blank
147	176	A30+	25. Item name (NAME)
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	Format	Description
1	1	A1	Blank or ";" if HLINES=Y and there are no responses or deleted (status = -2, -3)
2	6	I5	1. The item sequence number (ENTRY)
7	14	F8.2	2. Item's calibration (user-rescaled by UMEAN=, USCALE=, UDECIM) (MEASURE)
15	17	I3	3. The item's status (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	I6	4. The number of responses used in calibrating (COUNT) or the observed count (TOTAL=Y)
24	30	I6	5. The raw score used in calibrating (SCORE) or the observed score (TOTAL=Y)
31	37	F7.2	6. Item calibration's standard error (user-rescaled by USCALE=, UDECIM=) (ERROR)
38	44	F7.2	7. Item mean square infit (IN.MSQ)
45	51	F7.2	8. Item infit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
52	58	F7.2	9. Item mean square outfit (OUT.MS)
59	65	F7.2	10. Item outfit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
66	72	F7.2	11. Item displacement (user-rescaled by USCALE=, UDECIM=) (DISPLACE)
73	79	F7.2	12. Item by test-score correlation: point-biserial (PTBS) or point-measure (PTME)
80	80	1X	15. Blank
81	81	A1	16. Grouping to which item belongs (G)
82	82	1X	17. Blank
83	83	A1	18. Model used for analysis (R=Rating, S=Success, F=Failure) (M)
84	84	1X	19. Blank
85	132+	A30+	18. Item name (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