DISFILE=filename produces an output file containing the counts for each distractor or option or category of each item, similar to Table 10.3.
DISFILE=? opens a Browse window
This file contains 1 heading lines (unless HLINES=N), followed by one line for each CODES= of each item (whether the code is observed for the item or not) containing:
Columns: |
|||
Start: |
End: |
Heading |
Description |
1 |
10 |
ITEM |
Item entry number |
11 |
20 |
CODE |
Response code in CODES= or *** = missing (not subtotal) |
21 |
25 |
VALUE |
Numerical value of the response code (directly or with KEYn=, NEWSCORE=, IVALUEx=, MISSCORE= etc.). -1 means "response is ignored" |
27 |
30 |
SCORE |
Score used for estimating the Rasch item measure (after recounting, weighting, etc.). -1 means "response is ignored" |
31 |
40 |
ALL |
Count of all valid response codes in data set (excludes missing except for "MISSING" lines) |
41 |
50 |
ALL% |
Percent of ALL responses to this item = P(ercent)-value of response |
51 |
60 |
USED |
Count of response codes used for measurement (non-extreme persons and items) |
61 |
70 |
USED |
% of USED responses to this item |
71 |
80 |
AVGE MEAS |
Average person measure for these used responses |
81 |
90 |
S.E. MEAS |
Standard Error of average person measure |
91 |
100 |
OUTF MNSQ |
Outfit Mean-square of responses in this category. |
101 |
110 |
PTMEA PTBSA PTBSE |
Point-measure correlation, or PTBSA Point-biserial PTBIS=A (all items in raw score), or PTBSE Point-biserial PTBIS=Y (all items except this item in raw score), for this response (distractor, option). Scored responses are correlated only with scored responses. Missing responses are correlated with all responses. |
112 |
- |
LABEL |
Item label |
Since the DISFILE= has the same number of CODES= and MISSING "***" entries for every item, the repeated fields are filled out with "0" for any unobserved response codes.
Percentages for non-missing response-scores are computed based on total count of non-missing response scores. Percentages for missing response-scores are computed based on total count of all response scores.
When CSV=Y, commas separate the values with quotation marks around the "Item label", response in CODES=, and ***. When CSV=T, the commas are replaced by tab characters.
Example: You wish to write a file on disk called "DISCOUNT.TXT" containing the item distractor counts from table 14.3, for use in constructing your own tables:
DISFILE=DISCOUNT.TXT
