Subscale measures |
This is for 32-bit Facets 3.87. Here is Help for 64-bit Facets 4
In your Facets specification file, group each item with its subscale number.
In Labels=, include a dummy "subscale" facet, with the subscales as elements.
In Dvalues=, the subscale element number is the item element group number:
Example:
Labels=
1, Students
.....
*
2,items ; Items are facet 2
1-16 = addition,,1 ; addition items in group 1, are numbered 1 through 16.
17-32 = subtraction,,2 ; subtraction items, in group 2, are numbered 17 through 32.
33-45 = multiplication,,3 ; multiplication items in group 3, are numbered 33 through 45.
*
3, subscales, D ; dummy facet for subscale reporting - all elements anchored at 0
1, addition
2, subtraction
3, multiplication
*
Dvalues = ; data file has student number and 45 item responses.
1, 1-45
3, 2, $GROUP
*
Then,
1. Run the Facets analysis
2. "Output Tables" menu - Table 13.
Select Table 13 and temporary output file.
3. When Table 13 appears, it will look like this:
Table 13.4.1 Bias/Interaction Report (arranged by mN).
Bias/Interaction: 1. Children, 3. subscales (higher score = higher bias measure)
+--------------------------------------------------------------------------------------------------------------------------------+
|Observd Expctd Observd Obs-Exp| +Bias Model |Infit Outfit| Children subscales |
| Score Score Count Average| Size S.E. t d.f. Prob. | MnSq MnSq | Sq Num Childr measr+ N subscale measr- |
|---------------------------------+---------------------------------+------------+-----------------------------------------------|
| 13 7.33 13 .44| 3.53 1.80 1.96 12 .0731 | .0 .0 | 216572 16691 16691 .04 3 addition .00 |
| 13 7.33 13 .44| 3.53 1.80 1.96 12 .0731 | .0 .0 | 254516 54657 54657 .04 3 addition .00 |
| 13 7.88 13 .39| 3.00 1.53 1.96 12 .0740 | .0 .0 | 204335 4451 4451 .23 3 addition .00 |
Important columns are Observd score, +Bias Size, Children num, measr+, subscales N
4. At the top of the output file: delete all rows down to "Observd"
5. At the bottom of the output file: delete all rows up to ---- row above Mean
6. Select all and copy
7. paste into a new Excel worksheet: it will all go into column A
8. in Excel: Select column A
Data - Text to columns - Fixed width - Next
(The columns we want are identified) Next
Finish
(the table is now in Excel columns
9. Delete all columns except: Observed Score, +Bias Size, Children Num, measr+, N
There are 5 columns left
10. Delete Rows 1 and 3, so only heading are Score, Size, Num, overall measr (edit this), N
11. make new column F with top row: subscale measure
12. cell F2: =B2+D2 (this is the subscale measure)
13. copy cell F2 down the other rows of column F
14. select all the rows and sort sort by N then Num
15. the overall measures are now in column D.
the values for subscale 1 in column F
16. copy and paste columns E and F for subscale 2 by value into columns G and H (also copy column A if raw scores are needed)
17. copy and paste columns E and F for subscale 3 by value into columns I and J (also copy column A if raw scores are needed)
18. delete all rows for subscale 2 and 3
19. the Excel spreadsheet now has the overall measure and 3 subscale measures for each person
Help for Facets Rasch Measurement and Rasch Analysis Software: www.winsteps.com Author: John Michael Linacre.
Facets Rasch measurement software.
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