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DOCOMNT RIESUBE ED 171 786 TH 009 257
DOCOMNT RIESUBE ED 171 786 TH 009 257 AUTHOR Hill, Richard K TITLE Use of the Rasch Model tc Sc lve Data Problems Encountered by the California Assessment Program
INSTRUCTION MANUAL - Janome
5 q w e Dropping the Feed Dog The drop feed lever is located underneath the free-arm bed on the backside of the machine To drop the feed dog, push the lever in the
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F-LE 1b F-LE 1c 3, 5 IM: Interesting Interest Rates IM: Basketball Bounces VN: Linear-quadratic-exponential-model F-LE 3 3 DM: Falling Glowsticks DM: Toothpicks DM: Falling Rocks IM: Exponential growth versus linear growth I Exponential growth versus linear growth II Population and Food Supply HOT Tasks
The Frobenius Complex
R´esum ´e Motive par le probl´ `eme de Frobenius classique, nous introduisons l’ensemble partiellement ordonn e de´ Frobenius sur les entiers Z, c a d que pour un sous-semigroupe` de les entiers non-negatifs´ (N;+) nous d´efinissons l’ordre par n m si m n 2 Quand le est engendr´e par deux nombres a et b, relativement premiers entre
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DOCOMNT RIESUBE
ED 171 786
TH 009 257
AUTHOR
Hill, Richard K.
TITLEUse of the Rasch Model tc Sc lve. Data ProblemsEncountered by the California Assessment Program.
PUB DATE
Apr 79
NOTE11p. ;Paper presented at the Annual Meeting of the
National Council on Measurement in Education (San
Francisco, California, April, 1979)
EDES PRICE
MF01/PC01 Plus Postage.
DESCRIPTORSBlack Students; Caucasian Students; *ComplexityLevel; Cultural Differences; *Data Analysis; Item
Analysis; *Mathematical Models; Primary Education;Racial Differences; Reading Achievement; *Reading
Tests; Spanish Americans; State Programs; *Test Bias; *Testing Problems; Testing Programs; Test ItemsIDENTIFIERS
California; California Acc=ccraont Program; Rasch
Model; *Basch Scaled Scores
ABSTRACT
Pour problems faced by the staff of the California Assessment Program (CAP) were solved by applying Rasch scaling techniques: (1) item cultural bias in the Entry Level Test (ELT) given to all first grade pupils; (2)nonlinear regression analysis of the third grade Reading Test scores; (3) comparison et school growth from grades two to three, using the Reading Test; Sand (4)analysis of growth from grades two to three, based on the Reading Test,in the areas of word identification, vocabulary, comprehension, and studylocational skills. Solution of the prcblems demonstrated thatexisting Pasch Models have practical significance and should be more
widely used by educators. (MH) Reproductions supplied by EDRS are the best that can be made from the original dccument. fA Z o Dm 33 ocnI0m >I mIX 0m ZDm'm50,zzm,mm mrli mgmm-0C 0 z m cn1g 4 .Is m 33
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cn IzOn5,?,,T .twiyz> w0 Data Problems Encountered by the California Assessment Program*of,T5E.u, zing ''ri.T,Alm zdFmm m z mow- --m'Ismvioo.mm"11'7m mr ,rxioRMC Research Corporation
03I This paper presents four problems that the staff of the California Assessment Program (CAP), the statewide testing program for the state ofCalifornia, found difficult to solve.
Each of these problems proved to
be readily solvable when techniques being developed by advocates of the ti Rasch model were applied.The purpose of this paper is not to present new approaches for using the Rasch model, but to demonstrate that the approaches that have been developed already have great practical significance and should be disseminated and used more widely by practitioners.CZ)UJItem Cultural Bias in the Entry Level Test
In order to collect baseline data, the California Assessment Program annually administers the Entry Level Test (ELT) to every first grader inCalifornia each September.
At the time of the first administration of the
ELT in September, 1973, it consisted of 36 items covering five subtests. Along with item data, the ethnic group of each child was reported. A one percent systematic sample of the state resulted in a file of 3,010 pupils available for analysis.The problem was to determine which, if any, of
the test items contained cultural bias. The approach taken by the staff at that time was to run a factor analysis, considering responses to each of the items and membership in each of the ethnic groups to be a variable.The factor structure of the
test itself was quite clean; most of the 36 items loaded into only one factor, and loaded jointly only with all the other items in their own subtest. The loadings of the ethnic groups were much less definitive, and it was not known if the problem was one of statistics, such as the restric- tion of range of interitem correlations when items are extremely easy (several items in the test had p-values greater than .9), or if the items in the tests were truly unbiased.The results of this analysis were reported
by Lorrie Shepard at the 1975 NCME Annual Meeting in a paper entitledDeveloping the California Entry Level Test:
Construct Validity of the
Subtests.
The opinion of the staff was that the amount of culturalbias in the test was unclear, although there was belief that it was relatively unbiased. Le.) (i?The data were reanalyzed last spring using the Rasch model. Rasch item difficulties were computed separately for whites, blacks, and Spanish- surnamed children.' Plots of Rasch item difficulties for whites versus cin blacks and whites versus SpaniE --surnamed wereconstructed.These two plots are shown as figures 1 an2.Each plot demonstrated two distinct
patterns of straight lines - orline consisting of the first six items on the test, and one very difficu item from the end of the test, and a second:: line drawn from theremainingtems. MEE *paper presented at the 1979 Air,' 4*, Meeting of the National Council onMeasurement in Education, Sat
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35Figure 1
kasch item difficulties for whites vs. Spanish-surnamed children on the Entry Level Test.1973,30
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Rash Item Difficulty
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igure 2 (60Rasch item difficulties for
whiteE vs. blacis DatheEntry Level Test,
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