03078cam a22003972u 4500001000800000005001700008007001400025008004100039035002000080037001900100040002700119091000800146100002300154245015300177260006800330300000900398500014500407520151600552530007902068533008102147650003302228650002402261650003302285650002602318650003502344650002402379650002402403650002102427650003302448650003002481650002402511653004202535653002402577856003702601984004202638521969120181019152214.0he u||024||||080220s1971 xxu ||| b ||| | eng d 9(ericd)ED049276 aED049276bERIC aericdbengcericddMvI amfm1 aSullins, Walter L.14aThe Effect of Sequential Dependence on the Sampling Distributions of KR-20, KR-21, and Split-Halves Reliabilitiesh[microform] /cWalter L. Sullins. a[Washington, D.C.] :bDistributed by ERIC Clearinghouse,c1971. a9 p. aERIC Note: Paper presented at the Annual Meeting of the American Educational Research Association, New York, New York, February 1971.5ericd aFive-hundred dichotomously scored response patterns were generated with sequentially independent (SI) items and 500 with dependent (SD) items for each of thirty-six combinations of sampling parameters (i.e., three test lengths, three sample sizes, and four item difficulty distributions). KR-20, KR-21, and Split-Half (S-H) reliabilities were computed for these 36,000 response matrices and cumulative distribution functions, each based on 500 trials, compiled. Comparison of the sampling distributions suggests that there is more similarity between the SI and SD cumulative distribution functions for KR-21 than KR-20, and either of these have more similarity than S-H. For KR-20, KR-21, and S-H, the similarity of sampling distributions under SI and SD varies directly with test length: the longer the test, the more similar the distributions. On the other hand, similarity varies inversely with sample size: the larger the sample, the more dissimilar the distributions. For both SI and SD item sets, the expected value of KR-21 is less than or equal to that of KR-20 which is less than or equal to the expected value of S-H. Also, for both item sets, the standard error of S-H is greater than that of KR-21 which is greater than or equal to the standard error of KR-20. The standard errors of the three reliability estimates vary inversely with sample size and test length, for both SI and SD items. In every case, SD increased the expected value of the estimate and decreased its standard error. (Author/AE) aMay also be available online. Address as at 14/8/18:uhttps://eric.ed.gov/ aMicrofiche.b[Washington D.C.]:cERIC Clearinghouseemicrofiches : positive.17aComparative Analysis.2ericd07aCorrelation.2ericd17aError of Measurement.2ericd07aItem Analysis.2ericd07aMeasurement Techniques.2ericd17aReliability.2ericd07aSample Size.2ericd07aSampling.2ericd17aStatistical Analysis.2ericd17aTest Construction.2ericd07aTrue Scores.2ericd1 aKuder Richardson Reliability Formulas0 aMonte Carlo Studies41uhttps://eric.ed.gov/?id=ED049276 aANLcmc 2253 ED049276d77000000056828