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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, for fixed fields and the standard field selection:
Columns:
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Start
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End
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Format
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Description
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1
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1
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A1
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Blank or ";" if HLINES=Y and there are no responses or deleted or extreme (status =0,-1, -2, -3)
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2
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6
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I5
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1. The item sequence number (ENTRY)
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7
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14
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F8.2
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2. Item's calibration (user-rescaled by UMEAN=, USCALE=, UDECIM) (MEASURE)
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15
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17
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I3
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3. The item's status (STATUS)
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2 = Anchored (fixed) calibration
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1 = Estimated calibration
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0 = Extreme minimum (estimated using EXTRSC=)
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-1 = Extreme maximum (estimated using EXTRSC=)
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-2 = No responses available for calibration
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-3 = Deleted by user
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-4 = Inestimable: high (all responses in the same category with ISGROUPS=0 or CUTHI=)
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-5 = Inestimable: low (all responses in the same category with ISGROUPS=0 or CUTLO=)
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-6 = Deselected
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18
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25
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F8.1
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4. The number of responses used in calibrating (COUNT) or the observed count (TOTAL=Y)
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26
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34
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F8.1
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5. The raw score used in calibrating (SCORE) or the observed score (TOTAL=Y)
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35
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41
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F7.2
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6. Item calibration's standard error (user-rescaled by USCALE=, UDECIM=) (ERROR)
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42
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48
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F7.2
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7. Item infit: mean square infit (IN.MSQ)
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49
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55
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F7.2
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8. Item infit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
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56
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62
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F7.2
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9. Item outfit: mean square outfit (OUT.MS)
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63
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69
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F7.2
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10. Item outfit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
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70
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76
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F7.2
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11. Item displacement (user-rescaled by USCALE=, UDECIM=) (DISPLACE)
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77
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83
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F7.2
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12. Item by test-score correlation: point-biserial (PTBS) or point-measure (PTME)
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84
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90
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F7.2
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13. Item weight (WEIGHT)
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91
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96
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F6.1
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14. Observed percent of observations matching prediction (OBSMA)
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97
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102
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F6.1
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15. Expected percent of observations matching prediction (EXPMA)
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103
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109
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F7.2
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16. Item discrimination (this is not a parameter, merely a descriptive statistic)
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If ASYMPTOTE=Yes:
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110
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115
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F6.2
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17. Item lower asymptote (LOWER)
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116
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121
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F6.2
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18. Item upper asymptote(UPPER)
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... add 12 to the next column locations
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If PVALUE=Yes:
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110
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115
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F6.2
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19. Item p-value or average rating (PVALUE)
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... add 6 to the next column locations
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110
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110
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1X
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Blank
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111
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111
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A1
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20. Grouping to which item belongs (G)
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112
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112
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1X
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Blank
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113
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113
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A1
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21. Model used for analysis (R=Rating, S=Success, F=Failure) (M)
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114
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114
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1X
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Blank
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115
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144+
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A30+
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22. Item name (NAME)
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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:
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Start
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End
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Format
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Description
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1
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1
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A1
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Blank or ";" if HLINES=Y and there are no responses or deleted (status = -2, -3)
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2
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6
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I5
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1. The item sequence number (ENTRY)
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7
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14
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F8.2
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2. Item's calibration (user-rescaled by UMEAN=, USCALE=, UDECIM) (MEASURE)
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15
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17
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I3
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3. The item's status (STATUS)
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2 = Anchored (fixed) calibration
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1 = Estimated calibration
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0 = Extreme minimum (estimated using EXTRSC=)
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-1 = Extreme maximum (estimated using EXTRSC=)
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-2 = No responses available for calibration
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-3 = Deleted by user
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18
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23
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I6
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4. The number of responses used in calibrating (COUNT) or the observed count (TOTAL=Y)
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24
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30
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I6
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5. The raw score used in calibrating (SCORE) or the observed score (TOTAL=Y)
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31
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37
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F7.2
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6. Item calibration's standard error (user-rescaled by USCALE=, UDECIM=) (ERROR)
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38
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44
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F7.2
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7. Item mean square infit (IN.MSQ)
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45
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51
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F7.2
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8. Item infit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
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52
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58
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F7.2
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9. Item mean square outfit (OUT.MS)
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59
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65
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F7.2
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10. Item outfit: t standardized (ZSTD), locally t standardized (ZEMP) or log-scaled (LOG)
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66
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72
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F7.2
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11. Item displacement (user-rescaled by USCALE=, UDECIM=) (DISPLACE)
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73
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79
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F7.2
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12. Item by test-score correlation: point-biserial (PTBS) or point-measure (PTME)
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80
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80
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1X
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15. Blank
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81
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81
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A1
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16. Grouping to which item belongs (G)
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82
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82
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1X
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17. Blank
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83
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83
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A1
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18. Model used for analysis (R=Rating, S=Success, F=Failure) (M)
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84
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84
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1X
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19. Blank
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85
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132+
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A30+
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18. Item name (NAME)
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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
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