Item analysis with spss software linkedin slideshare. How to use spss kuderrichardson20 kr20 reliability. Richardson, one was preferred, which was known to be kuder richardson formula 20. Secondly, i appologize for linking a file but i could not get the fonts for the formula right. Kuderrichardson formula 20 is appropriate for tests with dichotomously scored items. A comparison of the kuder richardson formula 20 and kappa. An example of such a set of commands is provided below, however, kr20 is generally.
Then i came across the kuder and richardson formula 20 that is basically a simplification of the cronbachs alpha, appropriate for dichotomous data cronbachs alpha is actually for likert scales. Kuderrichardson reliability coefficients kr20 and kr21. There are a number of formulea that apply to different situations. The splithalf reliability test by kuderrichardson formula 20 kr 20 to obtain a homogenous reliability index value ensured internal consistency of the instrument. This video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in excel. In psychometrics, the kuderrichardson formula 20 kr20, first published in 1937, is a measure of internal consistency reliability for measures with dichotomous choices. The kr20 is used to evaluate internal consistency among dichotomous variables. Skor berkisar antara 0 1, dimana mendekati 1 asumsinya adalah reliable.
This video demonstrates how to perform a kuderrichardson 20 kr20 test of internal consistency in spss. It is equivalent to performing the split half methodology on all combinations of questions and is applicable when each question is either right or wrong. K number of items p proportion of the examinees who got the item right q proportion of the examinees who got the item wrong. In the later kr21 mean, and standard deviation of the test are used to estimate reliability coefficient.
Beberapa ahli menyebut kr20 adalah bentuk spesial dari alpha cronbach. To investigate the effect of violating the assumption of equal item difficulty on kuderrichardson kr formula 21 reliability coefficient, 670 eighthand ninth grade students were administered 26 short, homogeneous tests of mathematics concepts and skills. Based on parallel tests administered at the same sitting the kr 20 estimates are compared with alternateform correlations and with oddeven correlations adjusted by the spearmanbrown prophecy formula. Results obtained by the kudarrichardson formula 20 adapted for use with rkw scoring are compared with three other reliability formulas. Click on an icon below for a free download of either of the following files. What the formla does is to estimate test reliability. A comparison of the kuder richardson formula 20 and kappa as estimates of the reliability of criterionreferenced tests by judith e. In statistics, the kuderrichardson formula 20 kr20 is a measure of internal consistency reliability for measures with dichotomous choices, first published in 1937. Reliability the consistency of a measure does it always measure the same thing 2. I want to use the kr20 to learn about the internal consistency of items. Kuderrichardson formula psychological testing britannica.
The mean cvr and mean cvi were calculated for the arabic dnt15 as indicators of content validity. Zotero is a powerful, easytouse research tool that helps you gather, organize, and analyze sources and then share the results of your research. Other articles where kuderrichardson formula is discussed. The problem that this research addressed was one of decision making. What is the kuderrichardson test for reliability and what. Stata12 software college station, texas was used for all analyses. Note that the matrix or ame should be at the item level and that it needs to be numeric not characters or factors.
Development and validation of an instrument to enhance the. Item analysis technique to improve test items and instruction 2. Kuderrichardson formulas also called kr formulas or kr coefficients of equivalence are a set of statistical tests designed to aid in evaluating the statistical reliability of psychometric measures. Variability of kuderrichardson formula 20 reliability estimates there are a number of different methods of estimating the reliability of a test. Kuderrichardson 20 kr20 scale reliability calculation. Later on a simpli ed form of this formula was given by them, known to be kuder richardson formula 21 or kr 21. Moyer a dissertation submitted to the faculty of the graduate college in partial fulfillment of the degree of doctor of education. These complement the standard excel capabilities and make it easier for you to perform the statistical analyses described in the rest of this website. I have calculated the cronbachs alpha for my dichotomous test. Online statistics helps you in estimating the test reliability using kuderrichardson formula 21 calculator. In psychometrics, the kuderrichardson formula 20 kr 20, first published in 1937, is a measure of internal consistency reliability for measures with dichotomous choices. Rumus kr 20 dan tutorial cara hitung dengan excel uji.
Psychometric validity and reliability statistics in r. This formula provides an average of estimates that would result from all. Kuderrichardson 20 kr20 scale reliability calculation can spss calculate the kr20 reliability figure for assessing scales that are composed of dichotomous items. Kuderrichardson formula 20 21 correlation is determined from a single administration of a test through a study of score variances. Kuderrichardson formula 20 used for performance tests. Performing a reliability analysis on a measurement tool in which the items are dichotomous. The internal consistency reliability and the testretest reliability were assessed using kuderrichardson formula 20 kr20 and spearmans correlation coefficient r. Berikut dibawah ini adalah rumus kuder richardson 20. Computes the reliability coefficient of a set of dichotomous items, whereas cronbachs alpha is used for multipoint scales.
Apabila pada artikel sebelumnya kita sudah membahas cara perhitungan reliabilitas instrumen dengan excel yang meliputi uji cronbach alpha, split half dan spearman brown, maka dalam artikel ini kita akan membahas cara perhitungan rumus kr 20 dengan menggunakan excel. The kr20, or kuderrichardson formula, measures overall test reliability. Suppose you make up a multiple choice personality test that decides a yesno question, like do you belong in slytherin house. Pdf determination of reliability and validity measures. A comparison of kuderrichardson formula 20 and kappa as. Kuderrichardson formula 20 kr 20 and kr21 provide an estimate of what is called internal consistency also. What is the difference between kuderrichardson kr20 and.
A comparison of kuderrichardson formula 20 and kappa as estimates of the reliability of criterionreferenced tests. What is the difference between kuderrichardson kr20 and cronbachs alpha and how do you formulate both. Kr20 can be computed only for binary data while alpha can be computed for items that are scored in virtually any fashion. Given three sets of criterionreferenced tests which were designed to be parallel in content, would a traditional.
Estimates internal consistency reliability given the mean m, standard deviation sd and k the number of items from a specific measure of interest. The kr 20 is used to evaluate internal consistency among dichotomous variables. Essentially it lets you know whether the exam as a whole discriminated among students who mastered the subject matter and those who did not. Kuder and richardson formula 20 real statistics using excel. Kuder richardson formula 20 and the abbreviation for it. What is the abbreviation for kuderrichardson formula 20. If you give the test to a bunch of people, you can use the kuderrichardson test on their results to try to tell you s. Can spss calculate the kuderrichardson 20 kr20 and kr21 coefficients of reliability for a scale. The kuder and richardson formula 20 test checks the internal consistency of measurements with dichotomous choices.
From our humble beginnings in publishing handscored, pinpunched interests assessments to powering todays cuttingedge online career planning systems, kuder continues to provide the best resources and tools to support effective career and education planning for students and adults. Kr20 and alpha are identical for such binary data as these. This calculates kuderricharson 20 for a given matrix or ame. Kuderrichardson reliability coefficients kr20 in spss.
It was first named as alpha by cronbach 1951, although an earlier version is the kuderrichardson formula 20 often shortened to kr20, which is the equivalent for dichotomous items, and guttman 1945 developed the same quantity under the name lambda2. The name of this formula stems from the fact that is the twentieth formula discussed in kuder and richardsons seminal paper on test reliability. Kuder richardson formula 20 kr 20 and kr 21 provide an. Sample tos remember understand apply total section a 4 1,3,7,9 6 10 20 section b 5 2,5,8,11,15 5 4 14 section c 3 6,17,21 7 6 16 total 12 18 20 50 34. Wikiproject psychology rated startclass, lowimportance this article is within the scope of wikiproject psychology, a collaborative effort to improve the coverage of psychology on wikipedia.
I use the kr20 instead of the cronbachs alpha because my items are noted on a binary scale. Kr20 abbreviation stands for kuderrichardson formula 20. Hi everybody, i need to calculate internal consistency reliability, using kuderrichardson formula 20 i was wondering if someone can explain how to calculate it using spss 20. Differences between kuderrichardson formula 20 and. The fivepoints likert scale showed an average score of above four points with content validity index cvi for icvi as 0. In addition, kr20 computes the item difficulty proportion of right answers, the average value of item difficulty, the item variance, the itemtest pointbiserial correlation coefficients, and the average value of itemtest correlation coefficients.
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