DISFILE= category/distractor/option count file

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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

 

      ITEM CODE     VALUE SCORE    UNWTD   UNWTD %       WTD     WTD % AVGE MEAS S.E. MEAS OUTF MNSQ     PTMEA LABEL

         1 *           -1   -1     17918     81.58   15958.0     79.77       .13       .01       .00       .02 -DANGER

         1 1            5    5       139      3.43     139.0      3.43       .54       .09      1.33       .18 -DANGER

         1 2            4    4      1587     39.21    1587.0     39.21       .25       .01      1.10       .25 -DANGER

         1 3            2    2      2016     49.81    2016.0     49.81      -.03       .01       .98      -.28 -DANGER

         1 4            1    1       174      4.30     174.0      4.30      -.04       .03      1.16      -.06 -DANGER

         1 8            3    3       131      3.24     131.0      3.24       .08       .03      1.11      -.01 -DANGER

 

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

UNWTD

Count of all valid response codes in data set (excludes missing except for "MISSING" lines)

41

50

UNWTD %

Percent of UNWTD responses to this item.

51

60

WTD

Count of all valid response codes (weighted with PWEIGHT=)  in data set (excludes missing except for "MISSING" lines)

61

70

WTD %

% of WTD responses to this item

71

80

AVGE MEAS

Average person measure for WTD responses

81

90

S.E. MEAS

Standard Error of average person measure for WTD responses = sqrt (S.D. (AVGE MEAS)  /  (WTD - 1) )

91

100

OUTF MNSQ

Outfit Mean-square of weighted responses in this category, omitting responses in extreme scores

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. Responses are weighted.

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


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