Results of NAEP DIF Analyses for the Geography National Main Assessment in 2001 (Accommodations Not Permitted [R2])
For dichotomously scored items, NAEP categorizes each item into one of three categories:
-
"A" (items exhibiting no DIF),
-
"B" (items exhibiting a week indication of DIF), or
-
"C" (items exhibiting a strong indication of DIF).
A plus sign (+) indicates that items are differentially easier for the focal group (female, Black, or Hispanic students) than for the reference group (male or White students) after making an adjustment for the overall level of proficiency in the two groups; a minus sign (-) indicates that items are differentially more difficult for the focal group than for the reference group. For polytomously scored items, NAEP categorizes items into "AA", "BB" or "CC" categories and the plus or minus sign has the same interpretation as dichotomously scored items. After reviewing "C" and "CC" items, subject-area specialists decided that no items were biased, so none were deleted from the scales for this reason.
Number of dichotomously scored items by grade and severity of differential item functioning, geography national main assessment (accommodations not permitted [R2]): 2001
| Grade |
DIF category |
Analysis |
| Male/female |
White/Black |
White/Hispanic |
| 4 |
C- |
0 |
0 |
0 |
| B- |
0 |
1 |
1 |
| A |
31 |
30 |
30 |
| B+ |
0 |
0 |
0 |
| C+ |
0 |
0 |
0 |
| 8 |
C- |
0 |
0 |
0 |
| B- |
0 |
0 |
0 |
| A |
33 |
31 |
31 |
| B+ |
0 |
2 |
2 |
| C+ |
0 |
0 |
0 |
| 12 |
C- |
0 |
1 |
0 |
| B- |
2 |
1 |
0 |
| A |
32 |
31 |
34 |
| B+ |
1 |
2 |
1 |
| C+ |
0 |
0 |
0 |
Items identified as "C" items in at least one comparison, geography national main assessment (accommodations not permitted [R2]): 2001
| Block |
Item |
Scale |
Grade |
Comparison |
Group favored |
| G4 |
G039301 |
Environment and society |
12 |
White/Black |
White |
Number of polytomously scored items by grade and severity of differential item functioning, geography national main assessment (accommodations not permitted [R2]): 2001
| Grade |
DIF category |
Analysis |
| Male/female |
White/Black |
White/Hispanic |
| 4 |
CC- |
0 |
0 |
0 |
| BB- |
0 |
2 |
0 |
| AA |
13 |
9 |
13 |
| BB+ |
0 |
2 |
0 |
| CC+ |
0 |
0 |
0 |
| 8 |
CC- |
0 |
1 |
0 |
| BB- |
0 |
2 |
2 |
| AA |
13 |
9 |
10 |
| BB+ |
0 |
1 |
1 |
| CC+ |
0 |
0 |
0 |
| 12 |
CC- |
0 |
1 |
1 |
| BB- |
1 |
0 |
2 |
| AA |
8 |
9 |
10 |
| BB+ |
3 |
2 |
0 |
| CC+ |
1 |
1 |
0 |
Items identified as "CC" items in at least one comparison, by block and item, geography national main assessment (accommodations not permitted [R2]): 2001
| Block |
Item |
Scale |
Grade |
Comparison |
Group favored |
| G4 |
G038801 |
Environment and society |
12 |
Male/female |
Female |
| G039201 |
Environment and society |
12 |
White/Black |
White |
| G039201 |
Environment and society |
12 |
White/Hispanic |
White |
| G6 |
G034801 |
Spatial dynamics and connections |
12 |
White/Black |
Black |
| G035001 |
Environment and society |
8 |
White/Black |
White |
Last updated 14 July 2008 (DR)
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